Fix so agents don't need to specify a required label twice

[marcusramberg]

My initial implementation of this was a bit suboptimal, as the agent would need to specify a required label like !foo=req,foo=req. This fixes so !foo=req is enough to be picked up by the agent.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 21.23%. Comparing base (3373f02) to head (563a4aa).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5684      +/-   ##
==========================================
- Coverage   21.23%   21.23%   -0.01%     
==========================================
  Files         423      423              
  Lines       38280    38283       +3     
==========================================
- Hits         8130     8128       -2     
- Misses      29396    29401       +5     
  Partials      754      754              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.