fix(storage,android): firebase_storage now respects android.builtInKotlin=true and only applies kotlin-android when built-in Kotlin is disabled≤

[Lyokone]

Description

Updates firebase_storage's Android Gradle configuration to respect android.builtInKotlin=true when deciding whether to apply kotlin-android. The plugin still defaults to the legacy Kotlin Gradle Plugin path for older AGP setups, but no longer forces KGP when built-in Kotlin has been explicitly enabled.

Related Issues

• Fixes Kotlin Gradle Plugin usage prevents Built-in Kotlin compatibility in Flutter #18347

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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