fix(android): clean old groovy style declaration in build.gradle files

[Lyokone]

Description

Remove stale buildscript classpath declarations from Kotlin-based Android plugins. Several plugins were shipping classpath 'com.android.tools.build:gradle:8.1.4' and classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:1.8.22") in their buildscript blocks, which can conflict with the app project's actual AGP/Kotlin versions and cause "cannot find symbol" errors during Java compilation.

Also removes a duplicate apply plugin: 'com.android.library' in firebase_analytics.

Affected plugins: cloud_functions, firebase_analytics, firebase_performance, firebase_storage, firebase_remote_config.

Related Issues

• Fixes [firebase_ai]: Android compilation failure #18138

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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