feat!: bump Firebase Android SDK to 35.0.0

[SelaseKay]

Description

Bumps the Firebase Android BoM from 34.19.0 to 35.0.0. This pull request only changes the version pin.

It is expected to fail CI until #18782 merges into this branch. That pull request holds the build fixes and the minSdk 24 floor that BoM 35 needs, and it only compiles against this pin. Merge order:

1. fix(android): build on Firebase BoM 35 and require minSdk 24 #18782 into feat/bump-android-sdk-35.0.0.
2. This pull request into main, once CI is green.

Related Issues

• Closes 🚀 [firebase_core] Bump Firebase Android SDK (34.19.0 → 35.0.0) #18765
• Fixes [cloud_firestore] Android: FieldValue.arrayRemove on nested maps blocks all Firestore calls for minutes (fixed by Firebase BoM 35) #18781

Checklist

Before you create this PR confirm that it meets all requirements listed below by checking the relevant checkboxes ([x]).
This will ensure a smooth and quick review process. Updating the pubspec.yaml and changelogs is not required.

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• My PR includes unit or integration tests for all changed/updated/fixed behaviors (See Contributor Guide).
• All existing and new tests are passing.
• I updated/added relevant documentation (doc comments with ///).
• The analyzer (melos run analyze) does not report any problems on my PR.
• I read and followed the Flutter Style Guide.
• I signed the CLA.
• I am willing to follow-up on review comments in a timely manner.

Breaking Change

Does your PR require plugin users to manually update their apps to accommodate your change?

• Yes, this is a breaking change.
• No, this is not a breaking change.

Firebase Android BoM 35 requires minSdk 24, so the Android plugins now require minSdk 24. Keep the feat!: title when squash-merging so the release marks this as breaking.

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