[Uptime] Run Sample uptime tests using @elastic/synthetics

package.json

@@ -439,6 +439,7 @@
     "@elastic/eslint-plugin-eui": "0.0.2",
     "@elastic/github-checks-reporter": "0.0.20b3",
     "@elastic/makelogs": "^6.0.0",
+    "@elastic/synthetics": "^1.0.0-beta.12",
     "@emotion/babel-preset-css-prop": "^11.2.0",
     "@emotion/jest": "^11.3.0",
     "@istanbuljs/schema": "^0.1.2",

packages/kbn-cli-dev-mode/src/get_server_watch_paths.test.ts

@@ -75,6 +75,7 @@ it('produces the right watch and ignore list', () => {
       <absolute path>/x-pack/plugins/security_solution/scripts,
       <absolute path>/x-pack/plugins/security_solution/server/lib/detection_engine/scripts,
       <absolute path>/x-pack/plugins/metrics_entities/server/scripts,
+      <absolute path>/x-pack/plugins/uptime/e2e,
     ]
   `);
 });

packages/kbn-cli-dev-mode/src/get_server_watch_paths.ts

@@ -66,6 +66,7 @@ export function getServerWatchPaths({ pluginPaths, pluginScanDirs }: Options) {
     fromRoot('x-pack/plugins/security_solution/scripts'),
     fromRoot('x-pack/plugins/security_solution/server/lib/detection_engine/scripts'),
     fromRoot('x-pack/plugins/metrics_entities/server/scripts'),
+    fromRoot('x-pack/plugins/uptime/e2e'),
   ];
 
   return {