Implement changes defined in ADR034 and 035

[NotTheEvilOne]

What this PR does / why we need it:
This PR implements changes required to suit ADR034 and 035.

Which issue(s) this PR fixes:
Fixes #376
Fixes #377
Requires #390

[codecov]

Codecov Report

❌ Patch coverage is 85.21739% with 68 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.48%. Comparing base (acc50b5) to head (0efc342).
⚠️ Report is 16 commits behind head on main.

Files with missing lines	Patch %	Lines
src/gardenlinux/features/__main__.py	54.54%	25 Missing ⚠️
src/gardenlinux/features/artifact_base_name.py	85.23%	22 Missing ⚠️
src/gardenlinux/s3/s3_artifacts.py	65.00%	7 Missing ⚠️
src/gardenlinux/features/c_name.py	93.02%	6 Missing ⚠️
src/gardenlinux/oci/container.py	66.66%	4 Missing ⚠️
src/gardenlinux/features/parser.py	66.66%	2 Missing ⚠️
src/gardenlinux/features/metadata_main.py	94.44%	1 Missing ⚠️
src/gardenlinux/oci/image_manifest.py	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #393      +/-   ##
==========================================
- Coverage   91.28%   90.48%   -0.80%     
==========================================
  Files          49       51       +2     
  Lines        2971     2986      +15     
==========================================
- Hits         2712     2702      -10     
- Misses        259      284      +25     

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