SIANXKE-346: Allow up-check to distinguish between errors and warnings

[beachmachine]

Changed

• Distinguish between errors and warnings on up-check
• Register built-in up-checks via the monitor_up_check signal

[codecov-commenter]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (a120ffc) 94.52% compared to head (a652ec6) 91.20%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #12      +/-   ##
==========================================
- Coverage   94.52%   91.20%   -3.32%     
==========================================
  Files           4        4              
  Lines          73       91      +18     
==========================================
+ Hits           69       83      +14     
- Misses          4        8       +4     

Files	Coverage Δ
anexia_monitoring/decorators.py	93.75% <ø> (ø)
anexia_monitoring/events.py	100.00% <ø> (ø)
anexia_monitoring/urls.py	100.00% <ø> (ø)
anexia_monitoring/views.py	90.00% <85.71%> (-4.24%)	⬇️

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[nezhar]

It seems that this only works for major versions:

• OK: https://github.com/anexia-it/anexia-monitoring-django/actions/runs/6588250164/job/17900110329#step:4:198
• Not OK: https://github.com/anexia-it/anexia-monitoring-django/actions/runs/6588250164/job/17900110902#step:4:187