Performance Testing to Code testing and coverage label migration

What does this MR do and why?

Migrate resources labeled with ~"Category:Performance Testing" to Category:Code Testing and Coverage per Removal of Performance Testing as a category (#1235 - closed)

Expected impact & dry-runs

https://gitlab.com/gitlab-org/quality/triage-ops/-/jobs/3918262832

impacting

• 4 issues
• 0 MR
• 1 Epic

Action items

• If adding environment variables for reactive processors, update config/triage-web.yaml and .gitlab/ci/triage-web.yml
• (If applicable) Add documentation to the handbook pages for Triage Operations =>
• (If applicable) Identify the affected groups and how to communicate to them:
  • /cc @person_or_group =>
  • Relevant Slack channels =>
  • Engineering week-in-review