fix(app_check): fix an issue with debug token that would sometime not be passed properly

[Lyokone]

Description

Fixes a firebase_app_check Pigeon migration regression where activate() passed a single debug token to native platforms but selected the Android token before the Apple token. The platform interface now selects the debug token for the current target platform, so iOS receives the Apple debug token when both Android and Apple debug providers are configured.

Adds a platform-interface regression test plus conditional Android/iOS E2E tests that exchange an App Check token when both Android and Apple debug tokens are configured.

Related Issues

• Fixes [firebase_app_check]: debugToken issue with 0.4.3 on simulator, works with 0.4.2 #18252

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]

lgtm