[WIP] Add flaky markers to flaky tests on macOS GitHub actions runners

[dwhswenson]

This PR will add flaky markers to tests that we see being flaky on macOS in GitHub action. I'm leaning toward just keeping this PR going for a bit (I expect there's more than one flaky test in this part of the code; I just haven't tracked which ones tend to be problematic). However, if people really want to have a separate PR for each one, we can do that too.

Developers certificate of origin

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[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (25fb327) 91.29% compared to head (03dd28f) 91.29%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #509   +/-   ##
=======================================
  Coverage   91.29%   91.29%           
=======================================
  Files         116      116           
  Lines        7056     7057    +1     
=======================================
+ Hits         6442     6443    +1     
  Misses        614      614           

Files Changed	Coverage Δ
...e/tests/utils/test_atommapping_network_plotting.py	100.00% <100.00%> (ø)

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[IAlibay]

@dwhswenson this has sat around for a while and it doesn't seem like we've been suffering from the issue anymore, do you mind if I close this PR?

[richardjgowers]

I think this flaky marker doesn't work if the runners are crashing anyway(?)