fix(remote_config): restores the Apple error mapping and accepts both throttling status spellings

[Lyokone]

Description

The Apple Pigeon migration stopped attaching Remote Config's structured error details, causing native errors to reach Dart with an unknown code. Native Apple and Android implementations also emit "throttled" while the Dart platform interface only recognized "throttle".

This restores the Apple error mapping and accepts both throttling status spellings so callers can reliably handle or filter fetch failures.

Related Issues

• Relates to 🐛 [firebase_remote_config] Prevent FirebaseException from clogging Sentry #10904

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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