Revert "feat: parallel partial witness handling in the partial witnes…

[stedfn]

…s actor (#12656)"

This reverts commit 692fa5c.

[codecov]

Codecov Report

Attention: Patch coverage is 93.10345% with 4 lines in your changes missing coverage. Please review.

Project coverage is 70.72%. Comparing base (cf45cc5) to head (e3acc3d).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
...alidation/partial_witness/partial_witness_actor.rs	87.87%	0 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #12741      +/-   ##
==========================================
- Coverage   70.72%   70.72%   -0.01%     
==========================================
  Files         848      848              
  Lines      174212   174258      +46     
  Branches   174212   174258      +46     
==========================================
+ Hits       123219   123244      +25     
- Misses      45850    45862      +12     
- Partials     5143     5152       +9     

Flag	Coverage Δ
backward-compatibility	0.16% <0.00%> (-0.01%)	⬇️
db-migration	0.16% <0.00%> (-0.01%)	⬇️
genesis-check	1.35% <0.00%> (-0.01%)	⬇️
linux	69.21% <89.65%> (-0.03%)	⬇️
linux-nightly	70.31% <93.10%> (+<0.01%)	⬆️
pytests	1.65% <0.00%> (-0.01%)	⬇️
sanity-checks	1.46% <0.00%> (-0.01%)	⬇️
unittests	70.55% <93.10%> (-0.01%)	⬇️
upgradability	0.20% <0.00%> (-0.01%)	⬇️

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