build(ci): Make ember test runs more restrictive (#3906)

Only run ember tests if the ember package has been changed. Previously
we would run ember tests if ember or any of it's dependencies changed
(like hub, core, types etc.)

Author: AbhiPrasad

.github/workflows/build.yml

@@ -233,7 +233,7 @@ jobs:
         id: changed-files-specific
         uses: tj-actions/[email protected]
         with:
-          files: .*packages\/(ember|browser|core|tracing|hub|minimal|types|utils)($|/.*)
+          files: .*packages\/ember($|/.*)
       # Only run ember tests if the files above have changed
       - name: Run Ember tests
         if: steps.changed-files-specific.outputs.any_changed == 'true' || github.event_name == 'push'