Add create pull request and auto-merge PR to release workflow

[gsheni]

• Fixes Copulas release workflow errors with failed to push some refs to https://github.com/sdv-dev/Copulas #478
• Successful Test PyPI Release:
  • https://github.com/sdv-dev/Copulas/actions/runs/15718807849/job/44295149953
  • https://test.pypi.org/project/copulas/0.12.4.dev11/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.14%. Comparing base (725688f) to head (6e38d15).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #479   +/-   ##
=======================================
  Coverage   90.14%   90.14%           
=======================================
  Files          29       29           
  Lines        1826     1826           
=======================================
  Hits         1646     1646           
  Misses        180      180           

Flag	Coverage Δ
integration	79.73% <100.00%> (ø)
unit	86.85% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ 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.

[amontanez24]

I forgot to mention this but you will have to update the make release command because it creates the tag automatically and we said that we would create the tag on github when publishing the release. We should also update the release notes to match this

[amontanez24]

The tag would not have been made yet in this case. The releaser will need to create the tag through the UI