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This PR marks the `--ios-language objc` flag as deprecated for plugin creation. It introduces a warning message in the `flutter create` tool when the flag is used, but **does not** remove the functionality at this time. This is the first step towards its eventual removal. ## Context As discussed in the issue, usage metrics show that Objective-C is used in less than 4% of newly created plugins. To streamline the tool and align with modern iOS development practices (i.e., Swift), we are beginning the process of phasing out this option **Changes:** - Adds a deprecation warning to the CLI when the `objc` flag is used. - Updates the `--help` text to reflect the deprecation. - Removes obsolete tests for Objective-C plugin creation and usage tracking. ## Testing I have validated these changes by: 1. Manually running `flutter-dev create` with the `objc` flag to confirm the new deprecation warning appears. 2. Verifying that creating a plugin without the --ios-language flag does **not** trigger the warning. 3. Running the tests in the `test/commands.shard` to ensure no regressions were introduced. 4. CI will validate the changes to the devicelab tests. Fixes #169683 ## Pre-launch Checklist - [X] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [X] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [X] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [X] I signed the [CLA]. - [X] I listed at least one issue that this PR fixes in the description above. - [] I updated/added relevant documentation (doc comments with `///`). - [] I added new tests to check the change I am making, or this PR is [test-exempt]. - [] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [X] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-new channel on [Discord]. **Note**: The Flutter team is currently trialing the use of [Gemini Code Assist for GitHub](https://developers.google.com/gemini-code-assist/docs/review-github-code). Comments from the `gemini-code-assist` bot should not be taken as authoritative feedback from the Flutter team. If you find its comments useful you can update your code accordingly, but if you are unsure or disagree with the feedback, please feel free to wait for a Flutter team member's review for guidance on which automated comments should be addressed. <!-- Links --> [Contributor Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview [Tree Hygiene]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md [test-exempt]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests [Flutter Style Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md [Features we expect every widget to implement]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement [CLA]: https://cla.developers.google.com/ [flutter/tests]: https://github.com/flutter/tests [breaking change policy]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes [Discord]: https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md [Data Driven Fixes]: https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md