introduce a simple abstraction for easier handling of finalizers

[metlos]

This can be used for simplification of the finalizer handling in the controllers.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
12.6% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

Attention: Patch coverage is 70.00000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 78.60%. Comparing base (109b36e) to head (ab69e4f).

Files with missing lines	Patch %	Lines
pkg/finalizers/finalizers.go	70.00%	7 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #485      +/-   ##
==========================================
- Coverage   78.70%   78.60%   -0.10%     
==========================================
  Files          52       53       +1     
  Lines        2648     2678      +30     
==========================================
+ Hits         2084     2105      +21     
- Misses        502      509       +7     
- Partials       62       64       +2     

Files with missing lines	Coverage Δ
pkg/finalizers/finalizers.go	70.00% <70.00%> (ø)

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[metlos]

We will no go ahead with this. It's not bringing enough benefit and doesn't fit all the usecases.