Add support to create pre-releases with a generated changelog

[NotTheEvilOne]

What this PR does / why we need it:
This PR enhances existing tooling to handle GitHub releases and adds support to generate a changelog for new releases of the python-gardenlinux-lib.

Which issue(s) this PR fixes:
Fixes #229
Fixes gardenlinux/gardenlinux#3800
Superseeds #210
Superseeds #230

[yeoldegrove]

It would be great if this PR adds a written document on how (pre-)releases are created and which steps this includes.

[codecov]

Codecov Report

❌ Patch coverage is 88.61789% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.30%. Comparing base (9bc3c1f) to head (56af670).

Files with missing lines	Patch %	Lines
src/gardenlinux/github/release/__main__.py	70.37%	8 Missing ⚠️
src/gardenlinux/github/release/release.py	92.42%	5 Missing ⚠️
src/gardenlinux/github/client.py	95.83%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #271      +/-   ##
==========================================
- Coverage   91.54%   91.30%   -0.25%     
==========================================
  Files          42       45       +3     
  Lines        2070     2173     +103     
==========================================
+ Hits         1895     1984      +89     
- Misses        175      189      +14     

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