[Fix] Mutation warnings appear twice after drafts become ready

[zoomote]

​Created by Roomote. Follow up by mentioning @roomote, in the web UI, or in Discord.

What changed

Changed-code mutation testing now skips pull-request jobs while the PR is a draft. It starts when the PR becomes ready and continues to run for reviewable opens, new commits, reopens, and merge-queue checks.

Focused workflow tests model the draft-open to ready transition and preserve the supported reviewable event paths.

Why this change was made

PR #1644 showed GitHub retaining annotations from both the draft-open run and the ready-for-review run for the same head SHA. Within-run warning deduplication cannot remove annotations belonging to an earlier workflow run.

Impact

Draft PR creation no longer emits mutation annotations that GitHub can display again beside the ready-for-review results. Mutation enforcement remains unchanged once a PR is reviewable and in the merge queue.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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