Completely remove kubelet-config component

[twz123]

Description

K0s 1.29 did a full removal of the component from the cluster. Remove the old kubelet-config component completely now. Leave some checks in the integration tests that verify the non-existence of the manifest folder of the kubelet-config stack for current versions of k0s.

See:

• Remove kubelet-config stack after deprecation in 1.26 #3891
• Replace kubelet-config with worker-config component #2425

Type of change

• 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
• Auto test added

Checklist:

• My code follows the style guidelines of this project
• My commit messages are signed-off
• 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
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

[github-actions]

The PR is marked as stale since no activity has been recorded in 30 days

[twz123]

Tests should pass as soon as the main branch is bumped to Kubernetes 1.30.

[twz123]

Kubernetes is now bumped to v1.30. This needs to be rebased now.