[TO BE REMOVED] modified example app to use builtin git

[REMOVE BEFORE MERGING] modified example app to use builtin git

Temporary test commit.
So we can test the stub implementation in the previous commit is enough
to satisfy its only user so far, vscode.git@1.72.2 . This extension will
need to be in the `plugins` folder, along with its companion
vscode.git-base@1.72.2, ince they are not published yet.

Do not run `yarn download:plugins` after adding the git extensions, since
the command might install another version along, which might interfere
with the tests.

Signed-off-by: Marc Dumais <marc.dumais@ericsson.com>

examples/browser/package.json

@@ -25,7 +25,6 @@
     "@theia/file-search": "1.37.0",
     "@theia/filesystem": "1.37.0",
     "@theia/getting-started": "1.37.0",
-    "@theia/git": "1.37.0",
     "@theia/keymaps": "1.37.0",
     "@theia/markers": "1.37.0",
     "@theia/memory-inspector": "1.37.0",

examples/browser/tsconfig.json

@@ -38,9 +38,6 @@
     {
       "path": "../../packages/getting-started"
     },
-    {
-      "path": "../../packages/git"
-    },
     {
       "path": "../../packages/keymaps"
     },

examples/electron/package.json

@@ -27,7 +27,6 @@
     "@theia/file-search": "1.37.0",
     "@theia/filesystem": "1.37.0",
     "@theia/getting-started": "1.37.0",
-    "@theia/git": "1.37.0",
     "@theia/keymaps": "1.37.0",
     "@theia/markers": "1.37.0",
     "@theia/memory-inspector": "1.37.0",

examples/electron/tsconfig.json

@@ -44,9 +44,6 @@
     {
       "path": "../../packages/getting-started"
     },
-    {
-      "path": "../../packages/git"
-    },
     {
       "path": "../../packages/keymaps"
     },

package.json

@@ -107,8 +107,6 @@
   "theiaPluginsExcludeIds": [
     "ms-vscode.js-debug-companion",
     "vscode.extension-editing",
-    "vscode.git",
-    "vscode.git-base",
     "vscode.github",
     "vscode.github-authentication",
     "vscode.ipynb",