[#2170] Fixed issue with profile_page_is_published() & get_active_app_names() CMS helpers

[Bartvaderkin]

Also added tests for page_display helpers

The problem was Page.application_namespace is not always the clean 'app_name' but gets postfixed with -app-config if the app-hook has an app-config. I fixed it by relying on the other field but it needs a little processing.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 98.24561% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 95.05%. Comparing base (4341c59) to head (da25f09).

Files	Patch %	Lines
src/open_inwoner/cms/utils/page_display.py	90.90%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1125   +/-   ##
========================================
  Coverage    95.05%   95.05%           
========================================
  Files          923      924    +1     
  Lines        32364    32401   +37     
========================================
+ Hits         30763    30799   +36     
- Misses        1601     1602    +1     

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