ref: Make sure both base status notifiers cache notifications

[scott-codecov]

The CheckNotifier inherits from StatusNotifier which is where notification caching was happening. CheckNotifier overrides the notify method but does not implement the caching. This PR refactors where the caching happens such that it can easily be reused in both base notifier classes.

[codecov]

Codecov Report

Merging #90 (e42e491) into main (4a4bb80) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

❗ Current head e42e491 differs from pull request most recent head d8b34be. Consider uploading reports for the commit d8b34be to get more accurate results

@@            Coverage Diff             @@
##             main      #90      +/-   ##
==========================================
- Coverage   98.47%   98.47%   -0.01%     
==========================================
  Files         362      362              
  Lines       26517    26494      -23     
==========================================
- Hits        26113    26090      -23     
  Misses        404      404              

Flag	Coverage Δ
integration	98.44% <100.00%> (-0.01%)	⬇️
latest-uploader-overall	98.44% <100.00%> (-0.01%)	⬇️
onlysomelabels	98.47% <100.00%> (-0.01%)	⬇️
unit	98.44% <100.00%> (-0.01%)	⬇️

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Components	Coverage Δ
NonTestCode	97.13% <100.00%> (-0.01%)	⬇️
OutsideTasks	98.24% <100.00%> (-0.01%)	⬇️

Files Changed	Coverage Δ
services/notification/notifiers/checks/base.py	98.22% <100.00%> (ø)
services/notification/notifiers/status/base.py	98.69% <100.00%> (+0.01%)	⬆️

... and 9 files with indirect coverage changes

Related Entrypoints
run/app.tasks.notify.Notify

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