Components: exclude mobile-only PRs from CHANGELOG update CI check

[chad1008]

What?

Excludes PRs changing only mobile/native files from the CI check for CHANGELOG updates

Why?

First noticed here, this check doesn't fit with the mobile team's current workflow, causing their PRs to fail unexpectedly.

How?

Sets the workflow to not run if all of the changed files are native/mobile, using the existing paths from the package's ts-config exclusion as a guide. I've also added an exclusion for *.native.scss files, which wouldn't be covered.

Note

As mentioned above, I've used ts-config's exclusions as a starting point, but I don't think there are actually any react-native-* directories in the package at the moment. I'm not sure if that makes it a good exclusion to include, or if it's obsolete and can be skipped.

Testing Instructions

1. Check out this PR, and create a new branch of off it
2. Update component files matching the modified paths:

• at least one *.native.js, *.native.scss, *.ios.js, and *.android.js file
• at least one file file in a react-native-* folder (you'll need to create one, as I don't think there are currently any in the package)

3. Push your changes and open a test PR. Confirm that the changelog verification check is not run.
4. Modify a non-mobile component file
5. Push you changes and confirm that the check does run as expected

[github-actions]

Flaky tests detected in d9f0624.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/4659385399
📝 Reported issues:

• [Flaky Test] Keeps focus in place on undo in template parts #49386 in /test/e2e/specs/site-editor/template-part.spec.js
• [Flaky Test] can create template parts via the block placeholder start blank option #49016 in /test/e2e/specs/site-editor/template-part.spec.js
• [Flaky Test] should stay in block settings after making a change in that area #42451 in /test/e2e/specs/widgets/customizing-widgets.spec.js

[ciampo]

🚀