chore(null): autoadd already-compliant files

[dbjorge]

Description of changes

This PR just runs yarn null:autoadd, mostly covering new files added with the android-setup feature that are already compliant.

I also made a minor update to the autoadd script to make it write its output in a prettier-compatible format, to avoid having to manually run fastpass:fix afterwards.

Pull request checklist

• Addresses an existing issue: Codebase should use strict null checks #2869
• Ran yarn fastpass
• [n/a] Added/updated relevant unit test(s) (and ran yarn test)
• [n/a] Verified code coverage for the changes made. Check coverage report at: <rootDir>/test-results/unit/coverage
• PR title AND final merge commit title both start with a semantic tag (fix:, chore:, feat(feature-name):, refactor:). See CONTRIBUTING.md.
• [n/a] (UI changes only) Added screenshots/GIFs to description above
• [n/a] (UI changes only) Verified usability with NVDA/JAWS