refactor: Improve namespace handling in AppInformer

[jannfis]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 35 lines in your changes missing coverage. Please review.

Project coverage is 46.75%. Comparing base (46b9eea) to head (50664ad).

Files with missing lines	Patch %	Lines
principal/options.go	0.00%	12 Missing ⚠️
cmd/principal/main.go	0.00%	10 Missing ⚠️
principal/server.go	69.23%	8 Missing ⚠️
internal/informer/application/options.go	40.00%	3 Missing ⚠️
internal/informer/application/appinformer.go	87.50%	1 Missing ⚠️
internal/informer/appproject/projectinformer.go	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #215      +/-   ##
==========================================
- Coverage   46.89%   46.75%   -0.15%     
==========================================
  Files          57       57              
  Lines        4956     4986      +30     
==========================================
+ Hits         2324     2331       +7     
- Misses       2451     2474      +23     
  Partials      181      181              

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[jannfis]

Will be replaced by a major overhaul of the AppInformer