refactor(linter): remove Message.fixed

[Sysix]

Pull request overview

This PR refactors the linter’s fixer diagnostics plumbing by removing the unused fixed state from fixer::Message, relying instead on the existing behavior where Fixer::fix() returns only the messages that were not applied.

Changes:

* Remove `fixed: bool` from `Message` and simplify `Message::new` accordingly.

* Simplify the fix-application loop by no longer mutating `Message` instances solely to toggle `fixed`.

[Sysix]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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• refactor(linter): remove Message.fixed #25040 👈 (View in Graphite)
• refactor(linter): remove MessageRule #25031 : 1 other dependent PR (#25032 )
• refactor(linter): remove Message.section_offset property #25030
• refactor(oxlint/linter/lsp): extend "ignore fixes" on diagnostic creation #24958
• refactor(oxlint/linter/lsp): move ignore logic to oxc_linter #24951
• main

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[Copilot]

Pull request overview

This PR refactors the linter’s fixer diagnostics plumbing by removing the unused fixed state from fixer::Message, relying instead on the existing behavior where Fixer::fix() returns only the messages that were not applied.

Changes:

• Remove fixed: bool from Message and simplify Message::new accordingly.
• Simplify the fix-application loop by no longer mutating Message instances solely to toggle fixed.

[codspeed-hq]

Merging this PR will not alter performance

✅ 5 untouched benchmarks
⏩ 71 skipped benchmarks¹

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_{Comparing 07-28-refactor_linter_remove_message.fixed_ (960cabb) with 07-28-refactor_linter_remove_messagerule_ (8c16760)}

Footnotes

1. 71 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩