Catch exceptions when trying to decode state restoration saved datas

[seelrd]

In packages/flutter/lib/src/services/restoration.dart's _decodeRestorationData function, this function adds a try-catch block to catch any errors happening when calling StandardMessageCodec().decodeMessage(). A FormatException can occur in StandardMessageCodec().decodeMessage() if the data saved for state restoration is corrupted.

This fixes #147456.

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[goderbauer]

Thanks for the contribution. Can you please add a test for this so we don't regress this in the future? Thank you!