[MINOR] chore: migrate coverage upload to qlty

[ayush-eb]

Migrate Coverage Upload to QLTY

Summary

This PR migrates coverage reporting from local-only to QLTY Cloud. Changes were made by AI and may contain mistakes - please review carefully.

Changes Made

1. Added XML coverage report generation in tox.ini:

   • Added coverage xml -o coverage.xml to the coverage environment
   • This generates a Cobertura XML file that QLTY can consume

2. Added QLTY coverage upload to .travis.yml:

   • Installs QLTY CLI in after_script section
   • Uploads coverage.xml to QLTY when running on master branch
   • Uses || true to prevent CI failures if upload fails

Setup Required

1. Set QLTY_COVERAGE_TOKEN in Travis CI environment variables:

   • Go to: https://qlty.sh/gh/eventbrite/pysoa/settings/coverage/reports
   • Copy the coverage token
   • Add it as QLTY_COVERAGE_TOKEN in Travis CI project settings

2. Verify coverage upload:

   • After merging, check that coverage appears in QLTY dashboard
   • Coverage upload only runs on master branch (default branch requirement)

Testing

• Coverage generation tested via existing tox configuration
• QLTY upload will be validated in CI after token is configured
• Note: Travis CI is deprecated - consider migrating to GitHub Actions or CircleCI in the future

Coverage Details

• Format: Cobertura XML (coverage.xml)
• Location: Repository root
• Generated by: tox -e coverage environment
• Upload trigger: Push to master branch