Cleanup unknown Helm chart manifest files

[twz123]

Description

Keep track of the generated filenames when reconciling Helm Chart extensions. After all files have been synchronized, remove any remaining unknown Helm chart manifest files. This way the synchronization will work correctly even if the Helm chart extension names and orders are changed. Collect errors during reconciliation in extension controller. This way, the reconciliation gets as close as possible to the desired state, even if some things in between are failing.

Fixes:

• 4698

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation update

How Has This Been Tested?

• [ ] Manual test
• [x] Auto test added

Checklist:

• [x] My code follows the style guidelines of this project
• [x] My commit messages are signed-off
• [x] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [ ] Any dependent changes have been merged and published in downstream modules
• [x] I have checked my code and corrected any misspellings

[k0s-bot]

Backport failed for release-1.30, because it was unable to cherry-pick the commit(s).

Please cherry-pick the changes locally and resolve any conflicts.

git fetch origin release-1.30
git worktree add -d .worktree/backport-4705-to-release-1.30 origin/release-1.30
cd .worktree/backport-4705-to-release-1.30
git switch --create backport-4705-to-release-1.30
git cherry-pick -x e0aa6a4977041b18f303d60c3dac7b330122fe22 394418d848de24ddfdd03f7f574d4e15f6ff1791 c1f8c7533a3bbaaa934620b14ff7da56fbed3f8f