[CI] Re-enable Detox e2e [DO NOT LAND]

[hramos]

This workflow was added recently, but was disabled as it was not green on master.

This PR re-enables the step in order to surface any failures. Do not land, unless test_detox_end_to_end is actually green.

[hramos]

The test_detox_end_to_end workflow is failing with the following error:

=== BUILD TARGET RNTester OF PROJECT RNTester WITH CONFIGURATION Release ===
+ DEST=/Users/distiller/react-native/RNTester/build/Build/Products/Release-iphonesimulator/RNTester.app
+ [[ Release = *Debug* ]]
+ BUNDLE_FILE=/Users/distiller/react-native/RNTester/build/Build/Products/Release-iphonesimulator/RNTester.app/main.jsbundle
+ node /Users/distiller/react-native/local-cli/cli.js bundle --entry-file RNTester/js/RNTesterApp.ios.js --platform ios --dev false --reset-cache --bundle-output /Users/distiller/react-native/RNTester/build/Build/Products/Release-iphonesimulator/RNTester.app/main.jsbundle --assets-dest /Users/distiller/react-native/RNTester/build/Build/Products/Release-iphonesimulator/RNTester.app
Scanning folders for symlinks in /Users/distiller/react-native/node_modules (28ms)
warning: the transform cache was reset.

`fsevents` unavailable (this watcher can only be used on Darwin)

Error: `fsevents` unavailable (this watcher can only be used on Darwin)
    at new FSEventsWatcher (/Users/distiller/react-native/node_modules/sane/src/fsevents_watcher.js:41:11)
    at createWatcher (/Users/distiller/react-native/node_modules/jest-haste-map/build/index.js:780:23)
    at Array.map (<anonymous>)
    at HasteMap._watch (/Users/distiller/react-native/node_modules/jest-haste-map/build/index.js:936:44)
    at _buildPromise._buildFileMap.then.then.hasteMap (/Users/distiller/react-native/node_modules/jest-haste-map/build/index.js:355:23)
    at <anonymous>
    at process._tickCallback (internal/process/next_tick.js:188:7)

+ [[ false != true ]]
+ [[ ! -f /Users/distiller/react-native/RNTester/build/Build/Products/Release-iphonesimulator/RNTester.app/main.jsbundle ]]
+ echo 'error: File /Users/distiller/react-native/RNTester/build/Build/Products/Release-iphonesimulator/RNTester.app/main.jsbundle does not exist. This must be a bug with'
error: File /Users/distiller/react-native/RNTester/build/Build/Products/Release-iphonesimulator/RNTester.app/main.jsbundle does not exist. This must be a bug with
+ echo 'React Native, please report it here: https://github.com/facebook/react-native/issues'
React Native, please report it here: https://github.com/facebook/react-native/issues
+ exit 2
** BUILD FAILED **

child_process.js:644
    throw err;
    ^

Error: Command failed: xcodebuild -project RNTester/RNTester.xcodeproj -scheme RNTester -configuration Release -sdk iphonesimulator -derivedDataPath RNTester/build -quiet
    at checkExecSyncError (child_process.js:601:13)
    at Object.execSync (child_process.js:641:13)
    at Object.<anonymous> (/Users/distiller/react-native/node_modules/detox/local-cli/detox-build.js:26:6)
    at Module._compile (module.js:652:30)
    at Object.Module._extensions..js (module.js:663:10)
    at Module.load (module.js:565:32)
    at tryModuleLoad (module.js:505:12)
    at Function.Module._load (module.js:497:3)
    at Function.Module.runMain (module.js:693:10)
    at startup (bootstrap_node.js:191:16)
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
Exited with code 1

[hramos]

Using Node 10, the following error is shown:

=== BUILD TARGET RNTester OF PROJECT RNTester WITH CONFIGURATION Release ===
+ DEST=/Users/distiller/react-native/RNTester/build/Build/Products/Release-iphonesimulator/RNTester.app
+ [[ Release = *Debug* ]]
+ BUNDLE_FILE=/Users/distiller/react-native/RNTester/build/Build/Products/Release-iphonesimulator/RNTester.app/main.jsbundle
+ node /Users/distiller/react-native/local-cli/cli.js bundle --entry-file RNTester/js/RNTesterApp.ios.js --platform ios --dev false --reset-cache --bundle-output /Users/distiller/react-native/RNTester/build/Build/Products/Release-iphonesimulator/RNTester.app/main.jsbundle --assets-dest /Users/distiller/react-native/RNTester/build/Build/Products/Release-iphonesimulator/RNTester.app
Scanning folders for symlinks in /Users/distiller/react-native/node_modules (26ms)
warning: the transform cache was reset.

jest-haste-map: @providesModule naming collision:
  Duplicate module name: @babel/code-frame
  Paths: /Users/distiller/Library/Caches/Yarn/v1/npm-@babel/code-frame-7.0.0-beta.56-09f76300673ac085d3b90e02aafa0ffc2c96846a/package.json collides with /Users/distiller/Library/Caches/Yarn/v1/npm-@babel/code-frame-7.0.0-beta.52-192483bfa0d1e467c101571c21029ccb74af2801/package.json

This error is caused by a @providesModule declaration with the same name across two different files.

Error: jest-haste-map: @providesModule naming collision:
  Duplicate module name: @babel/code-frame
  Paths: /Users/distiller/Library/Caches/Yarn/v1/npm-@babel/code-frame-7.0.0-beta.56-09f76300673ac085d3b90e02aafa0ffc2c96846a/package.json collides with /Users/distiller/Library/Caches/Yarn/v1/npm-@babel/code-frame-7.0.0-beta.52-192483bfa0d1e467c101571c21029ccb74af2801/package.json

This error is caused by a @providesModule declaration with the same name across two different files.
    at setModule (/Users/distiller/react-native/node_modules/jest-haste-map/build/index.js:462:17)
    at workerReply (/Users/distiller/react-native/node_modules/jest-haste-map/build/index.js:512:9)
    at process._tickCallback (internal/process/next_tick.js:68:7)

+ [[ false != true ]]
+ [[ ! -f /Users/distiller/react-native/RNTester/build/Build/Products/Release-iphonesimulator/RNTester.app/main.jsbundle ]]
+ echo 'error: File /Users/distiller/react-native/RNTester/build/Build/Products/Release-iphonesimulator/RNTester.app/main.jsbundle does not exist. This must be a bug with'
error: File /Users/distiller/react-native/RNTester/build/Build/Products/Release-iphonesimulator/RNTester.app/main.jsbundle does not exist. This must be a bug with
+ echo 'React Native, please report it here: https://github.com/facebook/react-native/issues'
React Native, please report it here: https://github.com/facebook/react-native/issues
+ exit 2
** BUILD FAILED **

child_process.js:643
    throw err;
    ^

Error: Command failed: xcodebuild -project RNTester/RNTester.xcodeproj -scheme RNTester -configuration Release -sdk iphonesimulator -derivedDataPath RNTester/build -quiet
    at checkExecSyncError (child_process.js:603:11)
    at Object.execSync (child_process.js:640:13)
    at Object.<anonymous> (/Users/distiller/react-native/node_modules/detox/local-cli/detox-build.js:26:6)
    at Module._compile (internal/modules/cjs/loader.js:702:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:713:10)
    at Module.load (internal/modules/cjs/loader.js:612:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:551:12)
    at Function.Module._load (internal/modules/cjs/loader.js:543:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:744:10)
    at startup (internal/bootstrap/node.js:238:19)
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
Exited with code 1