fix(database,android): fix an issue where setPersistenceEnabled needed to be called first

[Lyokone]

Description

Fixes an Android firebase_database regression where setPersistenceEnabled() could crash with Calls to setPersistenceEnabled() must be made before any other usage of FirebaseDatabase instance.

The Pigeon app settings already carry persistence and cache-size configuration to the native side. When a follow-up call such as goOnline() applies those settings first, the original setter message can arrive later and re-apply the same native SDK setting after the database has been used. Android now skips that duplicate native setter call when the value was already present in the Pigeon settings object.

An Android-only E2E regression test was added to cover calling setPersistenceEnabled() immediately before goOnline() on fresh database instances.

Related Issues

• Fixes [firebase_database]: android setPersistenceEnabled() must be made before any other usage #18254

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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