Limit changelog workflow to main pushes to stop Prepare failures on PRs

[Copilot]

Changelog workflow runs were failing in the Prepare job because release-drafter executed on pull_request events, where integration tokens (notably Dependabot-triggered runs) cannot create releases. This change scopes release drafting back to the branch where release metadata is intended to be generated: main.

• Trigger scope correction

  • Removed the pull_request trigger from .github/workflows/changelog.yml.
  • Kept push to main as the sole trigger for the changelog drafting workflow.

• Operational impact

  • PRs no longer attempt release creation in Prepare.
  • Release draft updates continue on main as intended.

on:
  push:
    branches:
      - main

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.87%. Comparing base (d67b7b6) to head (07c21f3).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #595   +/-   ##
=======================================
  Coverage   70.87%   70.87%           
=======================================
  Files          28       28           
  Lines        1971     1971           
=======================================
  Hits         1397     1397           
  Misses        574      574           

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