Allow for all reasonable PYAPP_EXEC_ entry types

[trappitsch]

• add app entry types to initialization
• set PYAPP_EXEC_X variable according to entry_type in toml file

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 97.36842% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 96.76%. Comparing base (dc2a42f) to head (89d2d52).

Files	Patch %	Lines
src/box/initialization.py	90.90%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #23      +/-   ##
==========================================
- Coverage   96.77%   96.76%   -0.01%     
==========================================
  Files          21       21              
  Lines        1085     1114      +29     
==========================================
+ Hits         1050     1078      +28     
- Misses         35       36       +1     

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