feat(messaging,ios): add support for actionIdentifier on iOS devices

[Lyokone]

Description

Adds RemoteMessage.actionIdentifier for Apple notification responses so apps can tell which notification action opened the app. The iOS implementation now passes UNNotificationResponse.actionIdentifier through the message conversion path for onMessageOpenedApp and initial notification handling.

Related Issues

• Fixes 🐛 Firebase messaging pass along action identifier to iOS #17315
• Closes feat(firebase_messaging, Apple): Adds the action identifier #17324

Checklist

• 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

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

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