refactor: alert on admitted parents only

[annekebr]

Fixes #379

Description

Checklist

• PR is rebased to/aimed at branch develop
• PR follows Contributing Guide
• Added tests (if necessary)
• Extended README/Documentation (if necessary)
• Adjusted versions of image and Helm chart in values.yaml and Chart.yaml (if necessary)

[codecov-commenter]

Codecov Report

Merging #492 (7aac0f2) into develop (29803af) will increase coverage by 0.19%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #492      +/-   ##
===========================================
+ Coverage    94.40%   94.59%   +0.19%     
===========================================
  Files           22       22              
  Lines         1125     1129       +4     
===========================================
+ Hits          1062     1068       +6     
+ Misses          63       61       -2     

Impacted Files	Coverage Δ
connaisseur/alert.py	98.03% <100.00%> (+0.05%)	⬆️
connaisseur/flask_application.py	94.79% <100.00%> (+2.16%)	⬆️

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[phbelitz]

no longer applicable with golang switch