fix(@angular-devkit/build-angular): ignore .git folder in browser-esbuild watcher

When running the builder in watch mode, and fetching the git repo that the project is contained in, any changes in the .git folder trigger a rebuild. This is especially annoying when the IDE that you use periodically fetches the repository, and the FETCH_HEAD file triggers the rebuild every time. With this change the .git folder will be ignored in the watcher

(cherry picked from commit 772fe84)

Author: romeomihalovics

packages/angular_devkit/build_angular/src/builders/browser-esbuild/index.ts

@@ -645,6 +645,7 @@ export async function* buildEsbuildBrowserInternal(
       // Ignore all node modules directories to avoid excessive file watchers.
       // Package changes are handled below by watching manifest and lock files.
       '**/node_modules/**',
+      '**/.git/**',
     ],
   });