fix(database): fix a regression with database localEvents handling

[Lyokone]

Description

Fixes runTransaction(applyLocally: false) in firebase_database on Android and iOS. The Pigeon rewrite carried the applyLocally value through Dart, but the native transaction calls ignored it and used the default local-event behavior; this now forwards the flag to the native SDK transaction APIs and adds integration coverage for the suppressed local-event path.

Related Issues

• Fixes [firebase_database]: runTransaction(applyLocally: false) no longer suppresses local-cache emit on 12.1.0+ (regression from #17686) #18247

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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[cabljac]

nit: this reconnects to firebase? is this required here? I may be missing something

[Lyokone]

When running applyLocally false, it's like you "disconnect" from realtime database, so you need to go back online after the test for the following to run properly :)

[cabljac]

lgtm, one small comment/nit