Align ProcessModuleConfig secret reconciler with other reconcilers

[gkrenn]

Description

This PR refactors the process module config secret reconciler to use a Query object.
It as well aligns the structure with other reconcilers and adds a cleanup for the secret created.

Jira

How can this be tested?

• Create a CloudNativeFullStack DynaKube and check if the pmc secret exists.
• Check the conditions in the DynaKube for pmc as well

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 92.15686% with 4 lines in your changes missing coverage. Please review.

Project coverage is 64.61%. Comparing base (9d2972d) to head (bc48950).

Files with missing lines	Patch %	Lines
...s/dynakube/processmoduleconfigsecret/reconciler.go	90.00%	2 Missing and 2 partials ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3991      +/-   ##
==========================================
+ Coverage   64.58%   64.61%   +0.02%     
==========================================
  Files         397      397              
  Lines       26416    26398      -18     
==========================================
- Hits        17062    17056       -6     
+ Misses       8028     8019       -9     
+ Partials     1326     1323       -3     

Flag	Coverage Δ
unittests	64.61% <92.15%> (+0.02%)	⬆️

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[waodim]

lgtm and works