ci(pact): add skip-contract-tests label escape hatch

[JakeNScale]

Summary

• Adds skip-contract-tests PR label as an emergency bypass for ConsumerContractTests and CanIDeploy jobs
• When label is present, both jobs are skipped (show as neutral/green, satisfying branch protection)
• Adds labeled trigger so applying the label immediately re-runs the workflow without needing a new commit
• Documents the escape hatch in README with setup instructions for the label

Notes

The skip-contract-tests label must be created manually in GitHub repo settings (name, color #e11d48, description). This is a one-time setup per repo.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 4.50%. Comparing base (5a0f9ff) to head (078c1d3).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #385   +/-   ##
=====================================
  Coverage   4.50%   4.50%           
=====================================
  Files         59      59           
  Lines       5751    5751           
=====================================
  Hits         259     259           
  Misses      5454    5454           
  Partials      38      38           

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