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fix(toml): remove `lib.plugin` key support and make it warning ### What does this PR try to resolve? Remove `lib.plugin` key, making it an "unused key" warning. Remove some of the tests, which should look useless (I hope I'm understanding this - [x] Remove key, and related tests. - [x] Adjust the documentation about the plugin. - [ ] Some of the comments and function names have not yet finished being modified. part of #13629 Closes #13246