Fini cell.ahaclient if the Cell creates it (SYN-6101)

[vEpiphyte]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.11% ⚠️

Comparison is base (69a28b0) 97.30% compared to head (a1e92e5) 97.19%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3324      +/-   ##
==========================================
- Coverage   97.30%   97.19%   -0.11%     
==========================================
  Files         228      228              
  Lines       46000    46001       +1     
==========================================
- Hits        44758    44709      -49     
- Misses       1242     1292      +50     

Flag	Coverage Δ
linux	97.19% <100.00%> (-0.01%)	⬇️
linux_replay	?

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Files Changed	Coverage Δ
synapse/lib/cell.py	97.81% <100.00%> (+<0.01%)	⬆️

... and 11 files with indirect coverage changes

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[MichaelSquires]

Seems like there's some value in the code from your first commit (where you added a postAnit and some other tracking code. Recommend adding that back as a test for making sure we're fini'ing everything correctly in the future.

[vEpiphyte]

I wanted to leave it in the branch as a "show your work" moment; but it is a pretty easy item to recreate in the future for any other objects we may find ourselves wanting to track.