tests: mark worker monitor tests flaky on macos

[pmrowla]

Mark celery worker monitoring tests as flaky for now (see #6)

[codecov-commenter]

Codecov Report

Merging #27 (02e72d9) into main (8348ed8) will decrease coverage by 0.21%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main      #27      +/-   ##
==========================================
- Coverage   86.62%   86.41%   -0.22%     
==========================================
  Files          18       18              
  Lines         673      677       +4     
  Branches       93       95       +2     
==========================================
+ Hits          583      585       +2     
  Misses         70       70              
- Partials       20       22       +2     

Impacted Files	Coverage Δ
tests/worker/test_temporary.py	93.33% <50.00%> (-6.67%)	⬇️

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