🛠️ add workflow that verifies .arb file was updated

[lesnitsky]

Is there an existing issue for this?

• [X] I have searched the existing issues and found no duplicates.

What plugin is this bug for?

Firebase UI Localizations

What platform(s) does this bug affect?

Android, iOS, Web, macOS, Linux, Windows

List of dependencies used.

flutter pub deps -s list

Steps to reproduce

NA

Expected Behavior

NA

Actual Behavior

NA

Additional Information

Many localization PRs only update .dart files, we need a CI step that verifies .arb was updated.