Cleanup Dynakube's config and enrichment secrets when deleting it

[albertogdd]

Description

https://dt-rnd.atlassian.net/browse/DAQ-2266

Currently, dynatrace-dynakube-config and dynatrace-metadata-enrichment-endpoint secrets doesn't get deleted when the Dynakube gets deleted.

This PR adds the cleanup of those.

How can this be tested?

• On main branch: deploy a DK and delete it, check that these secrets doesn't get deleted
• On this branch: do the same and check that they get deleted

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Codecov Report

Attention: Patch coverage is 62.50000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 64.66%. Comparing base (3075170) to head (46189bb).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/injection/namespace/mapper/dynakubes.go	25.00%	4 Missing and 2 partials ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4047      +/-   ##
==========================================
- Coverage   64.66%   64.66%   -0.01%     
==========================================
  Files         397      397              
  Lines       26466    26478      +12     
==========================================
+ Hits        17115    17121       +6     
- Misses       8023     8027       +4     
- Partials     1328     1330       +2     

Flag	Coverage Δ
unittests	64.66% <62.50%> (-0.01%)	⬇️

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[waodim]

tested it and the secrets get deleted - codewise nothing further to add from me