Update unhealthy tests quarantine documentation

Update unhealthy tests quarantine documentation

The quarantine process was recently updated in MR 16899.

Task

Update the public-facing documentation page to reflect the latest quarantine process changes:

• Page to update: https://docs.gitlab.com/development/testing_guide/unhealthy_tests/#quarantined-tests

Acceptance Criteria

• Review the changes made in the handbook MR
• Update the quarantined tests documentation to align with the new process
• Ensure all information is accurate and up-to-date
• Verify links and references are working correctly
• Create an ADR that describes the process

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Description was generated using AI