Add `LAST_BRANCH_POINT` stop point for `ReleaseNoteCompiler`

[cortadocodes]

Summary

Add a mode to the release notes compiler that only uses commits that are ahead of the base branch. This can be used instead of the current LAST_RELEASE mode which uses all commits since the last release in the full history starting from the tip of the current branch.

To use this new feature, replace LAST_RELEASE with LAST_BRANCH_POINT in your repository's .github/workflows/update-pull-request.yml file

Contents

New features

• [x] Add LAST_BRANCH_POINT stop point option to ReleaseNoteCompiler

Operations

• [x] Use LAST_BRANCH_POINT in pull request workflow
• [x] Fix mkver.conf so it correctly recognises major and minor version changes for breaking changes and features

Quality Checklist

• [x] New features are fully tested (No matter how much Coverage Karma you have)

[codecov-commenter]

Codecov Report

Merging #21 (9c62f4e) into main (3e7dc54) will decrease coverage by 0.08%. The diff coverage is 91.66%.

@@            Coverage Diff             @@
##             main      #21      +/-   ##
==========================================
- Coverage   95.43%   95.34%   -0.09%     
==========================================
  Files           3        3              
  Lines         197      215      +18     
==========================================
+ Hits          188      205      +17     
- Misses          9       10       +1     

Impacted Files	Coverage Δ
conventional_commits/compile_release_notes.py	91.58% <91.66%> (+0.57%)	:arrow_up:

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