feat: add git-based promotion directives

[krancour]

• clone
• overwrite
• commit
• push
• open pr
• wait for pr

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[codecov]

Codecov Report

Attention: Patch coverage is 48.01223% with 340 lines in your changes missing coverage. Please review.

Project coverage is 49.61%. Comparing base (a03e949) to head (e62495c).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/directives/git_open_pr_directive.go	47.59%	75 Missing and 23 partials ⚠️
internal/directives/git_clone_directive.go	35.76%	72 Missing and 16 partials ⚠️
internal/directives/git_wait_for_pr_directive.go	49.46%	41 Missing and 6 partials ⚠️
internal/directives/git_commit_directive.go	58.02%	26 Missing and 8 partials ⚠️
internal/directives/git_overwrite_directive.go	42.37%	29 Missing and 5 partials ⚠️
internal/directives/git_push_directive.go	50.00%	25 Missing and 7 partials ⚠️
internal/controller/freight/finder.go	50.00%	4 Missing ⚠️
internal/directives/copy_directive.go	0.00%	2 Missing ⚠️
internal/gitprovider/github/github.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2537      +/-   ##
==========================================
- Coverage   49.74%   49.61%   -0.13%     
==========================================
  Files         272      275       +3     
  Lines       19078    19684     +606     
==========================================
+ Hits         9490     9767     +277     
- Misses       9044     9312     +268     
- Partials      544      605      +61     

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[hiddeco]

I would probably make this a method to ensure we do not get it mixed up with the generateCommitMessage methods of the directives which produce Git commit messages as part of their output.

[krancour]

Fixed in e62495c