fix(messaging,ios): return NO from scene willConnectToSession

[SelaseKay]

Description

FLTFirebaseMessagingPlugin implemented scene:willConnectToSession:options: as void, while FlutterSceneLifeCycleDelegate declares it as BOOL. Flutter matches the selector by name and reads the return value. YES means the plugin consumed the connection, which skips cold-start deep link delivery and passes nil options to later plugins.

The method only copies notificationResponse into the plugin's initial-message state. It now returns BOOL and always returns NO, so that notification is still recorded and Flutter continues to deliver the connection.

Related Issues

Fixes #18731

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Breaking Change

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