remove finalizer code

[Shalucik]

Description

removed finalizer code, because we only use the finalizer to delete all child resources
something that k8s already does automatically because of OwnerReferences
therefor it's an unneeded redundancy that creates more problems than it solves
and therefor removed

Type of change

(Remove irrelevant options)

• Minor change (typo, formatting, version bump)
• New feature
• Improvement of existing feature
• Bugfix
• Refactoring
• Configuration change
• Breaking change

Checklist:

• I've double-checked the code in this PR myself
• I've left the code better than before (boy scout rule)
• The code is readable, comments are added that explain hard or non-obvious parts.
• I've expanded/improved the (unit) tests, when applicable
• I've run (unit) tests that prove my solution works
• There's no sensitive information like credentials in my PR