[material_ui] Migrate M3 `Banner` template to use new `gen_defaults` (#12227) Work towards https://github.com/flutter/flutter/issues/187899 Fixes https://github.com/flutter/flutter/issues/188402 ## Pre-Review Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [AI contribution guidelines] and understand my responsibilities, or I am not using AI tools. - [x] I read the [Tree Hygiene] page, which explains my responsibilities. - [x] I read and followed the [relevant style guides] and ran [the auto-formatter]. - [x] I signed the [CLA]. - [x] The title of the PR starts with the name of the package surrounded by square brackets, e.g. `[shared_preferences]` - [x] I [linked to at least one issue that this PR fixes] in the description above. - [x] I followed [the version and CHANGELOG instructions], using [semantic versioning] and the [repository CHANGELOG style], or I have commented below to indicate which documented exception this PR falls under[^1]. - [x] I updated/added any relevant documentation (doc comments with `///`). - [ ] I added new tests to check the change I am making, or I have commented below to indicate which [test exemption] this PR falls under[^1]. - [x] All existing and new tests are passing.
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