Remove "All right reserved" from all files (#10066)
Per guidance from legal on current preferred practice, remove "All rights reserved" from all LICENSE files and header blocks, and update the repo tool check accordingly.
[shared_preferences] Remove use of Pigeon's Dart test generator (#10325)
Updates shared_preferences_foundation's legacy implementation to use DI to inject the fake Pigeon API implementation, instead of the Dart test generator, matching the newer async code.
Also updates shared_preferences_android to remove dartHostTestHandler entries that were unused.
Part of https://github.com/flutter/flutter/issues/159886
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