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.
[image_picker] Remove use of Pigeon's Dart test generator (#10320)
Updates image_picker_ios to use the same test structure that image_picker_android already uses:
- Removes the use of Pigeon's Dart test generator in favor of DI'ing an implementation of the actual generated Dart API.
- Removes the use of the old method channel logger (which was adapted in place during the Pigeon conversion to minimize test changes in the PR that changed the implementation; the fact that it was still being used was tech debt), in favor of structured storage of passed arguments that can be queried directly. This makes tests much shorter and easier to understand and maintain, because if we want to check one parameter in a targeted test, we don't have to assert the entire argument dictionary.
- Adds some missing test functionality (e.g., we didn't have tests of any of the non-null return value handling), and removes some duplicate testing (e.g., every possible combination of null and non-null width, hight, and image quality in on giant test).
Also does minor cleanup of image_picker_android; this conversion had already been done there, but it was still generating an unused dartTestOut.
Part of https://github.com/flutter/flutter/issues/159886
## Pre-Review Checklist
[^1]: Regular contributors who have demonstrated familiarity with the repository guidelines only need to comment if the PR is not auto-exempted by repo tooling.