fix(messaging,android): fixing an issue with analytics being triggered twice

[Lyokone]

Description

The Analytics notification_open event was never logged when a notification was tapped while the app was backgrounded but still alive. The Messaging SDK logs that event from FcmLifecycleCallbacks.onActivityCreated, which only runs when the tap creates the Activity, so the warm path (Activity reused, intent delivered through onNewIntent) was silently missed. This logs the event from the plugin's onNewIntent, mirroring the SDK's own implementation including de-duplication by message id, and leaves the cold-start path untouched so nothing is counted twice.

Related Issues

• Fixes notification_open event not triggered properly when flutter app in background mode #17072
• Related upstream (same gap for native Android apps): notification_open never reported if onCreate of MainActivity was not called firebase-android-sdk#3799

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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