[stateless_validation] Rename StateWitnessActor to PartialWitnessActor

[shreyan-gupta]

Better organization of partial witness actor and actions. Renaming and pushing to a new module.

Only refactoring changes.

[codecov]

Codecov Report

Attention: Patch coverage is 93.50649% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 71.14%. Comparing base (408bc00) to head (3cd2132).

Files	Patch %	Lines
chain/network/src/peer/testonly.rs	0.00%	1 Missing and 1 partial ⚠️
chain/network/src/peer_manager/testonly.rs	0.00%	1 Missing and 1 partial ⚠️
chain/client/src/test_utils/test_env.rs	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #11191      +/-   ##
==========================================
- Coverage   71.15%   71.14%   -0.01%     
==========================================
  Files         783      783              
  Lines      155434   155438       +4     
  Branches   155434   155438       +4     
==========================================
- Hits       110594   110589       -5     
- Misses      40405    40419      +14     
+ Partials     4435     4430       -5     

Flag	Coverage Δ
backward-compatibility	0.24% <0.00%> (-0.01%)	⬇️
db-migration	0.24% <0.00%> (-0.01%)	⬇️
genesis-check	1.41% <0.00%> (-0.01%)	⬇️
integration-tests	37.10% <93.50%> (+0.02%)	⬆️
linux	69.24% <63.63%> (+<0.01%)	⬆️
linux-nightly	70.58% <93.50%> (-0.03%)	⬇️
macos	53.05% <43.83%> (-0.02%)	⬇️
pytests	1.63% <0.00%> (-0.01%)	⬇️
sanity-checks	1.42% <0.00%> (-0.01%)	⬇️
unittests	65.75% <42.85%> (-0.01%)	⬇️
upgradability	0.29% <0.00%> (-0.01%)	⬇️

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