Add GitHub workflow for generating release notes

[backmari]

Description of work:

Add a workflow that is triggered on new releases, or by manually running the workflow, and that creates a pull request with a file CHANGELOG.md generated from the GitHub releases.

Check all that apply:
(if not, provide an explanation in the work description)

• updated documentation and checked that it looks correct in the pull request preview
• Source added/refactored
• Added unit tests
• Added integration tests

References:

• Links to IBM EWM items:
• Links to related issues or pull requests:

⚠️ Manual test for the reviewer

(instructions to set up the environment)

Check list for the reviewer

• best software practices
  • clearly named variables (better to be verbose in variable names)
  • code comments explaining the intent of code blocks
• All the tests are passing
• The documentation is up to date and looks correct in the pull request preview
• code comments added when explaining intent

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.64%. Comparing base (1fdb1ac) to head (4634b4b).

Additional details and impacted files

@@           Coverage Diff           @@
##             next     #255   +/-   ##
=======================================
  Coverage   65.64%   65.64%           
=======================================
  Files          37       37           
  Lines        7010     7010           
=======================================
  Hits         4602     4602           
  Misses       2408     2408           

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• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.