fix(runs): forget a deleted run's mutant marks and coverage

[roxblnfk]

🔍 What was changed

• When Clear History or the retention limit deletes a run's archive, the editor no longer keeps that run's mutant marks, and the Testo coverage bundle applied from that run is closed (its gutters and the Coverage view go with it).
• Kept as before: closing the Mutations window or starting a run without coverage leaves marks and coverage in place, as the platform does with coverage until it is hidden or replaced. The run a tab is still showing is only marked Discard by Clear History, so its marks stay until the next prune deletes it.

Why?

The archive was deleted, but TestoMutationService kept the run in memory and the applied TestoCoverageSuite still pointed at its runDir, so the marks led into deleted diffs, reports and covering tests.

Checklist

• How was this tested:
  • Unit tests added (TestoMutationEditorMarksPsiTest: a cleared run's marks disappear)
  • check buildPlugin verifyPlugin for 262 locally: only the known Windows failures, verifier Compatible
  • Closing the coverage bundle checked in a running IDE

[github-actions]

Qodana for JVM

It seems all right 👌

No new problems were found according to the checks applied

💡 Qodana analysis was run in the pull request mode: only the changed files were checked

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