3xx - axon - reorder onfini to ensure slabs fini'd when exc's occur (SYN-9551)

[OCBender]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.35%. Comparing base (895bfcd) to head (0ed883a).
⚠️ Report is 1 commits behind head on synapse-3xx.

Additional details and impacted files

@@               Coverage Diff               @@
##           synapse-3xx    #4469      +/-   ##
===============================================
- Coverage        96.47%   96.35%   -0.12%     
===============================================
  Files              253      253              
  Lines            59787    59787              
===============================================
- Hits             57678    57609      -69     
- Misses            2109     2178      +69     

Flag	Coverage Δ
linux	96.35% <100.00%> (+<0.01%)	⬆️
linux_replay	?

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