ci: ignore material.dart deprecation per import

[polina-c]

Follow-up to #1058, as suggested in #1058 (comment).

#1058 made infos non-fatal on beta so that the package:flutter/material.dart deprecation wouldn't fail analysis. That turns off every other info on beta too, and it would have to be extended to stable once the deprecation ships there.

This restores flutter analyze --fatal-infos on both channels and instead ignores deprecated_member_use on each import 'package:flutter/material.dart'; (85 imports across packages/genui, examples/simple_chat, examples/verdure/client, dev_tools/catalog_gallery and dev_tools/composer):

// TODO(https://github.com/a2ui-project/a2ui/issues/3235): Migrate to material_ui.
// ignore: deprecated_member_use
import 'package:flutter/material.dart';

Migrating to package:material_ui still isn't an option, since it requires Flutter 3.47 and genui supports 3.35.7. The cleanup is tracked in a2ui-project/a2ui#3235.

[gemini-code-assist]

Code Review

This pull request adds TODO comments and deprecation ignore annotations to Flutter material imports across multiple files to prepare for a migration to material_ui. However, the added '// ignore: deprecated_member_use' comments are unnecessary and ineffective because importing material.dart does not trigger deprecation warnings, and line-level ignores in Dart only apply to the line immediately following them. It is recommended to remove these redundant ignore comments or use file-level ignores if deprecated members are actually used elsewhere in the files.

[ditman]

Thanks for addressing this so quickly, if CI is happy, I'm happy too!

[ditman]

I just realized that we need this too in the a2ui repo. I'll send a similar PR!