refactor: remove part functions from epoch manager

[stedfn]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 91.54930% with 6 lines in your changes missing coverage. Please review.

Project coverage is 70.37%. Comparing base (a33310b) to head (35f274a).
Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
chain/chunks/src/shards_manager_actor.rs	89.65%	0 Missing and 3 partials ⚠️
chain/chain/src/sharding.rs	95.45%	0 Missing and 1 partial ⚠️
chain/chunks/src/logic.rs	66.66%	0 Missing and 1 partial ⚠️
tools/mock-node/src/lib.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #12834      +/-   ##
==========================================
- Coverage   70.41%   70.37%   -0.04%     
==========================================
  Files         848      848              
  Lines      174938   174874      -64     
  Branches   174938   174874      -64     
==========================================
- Hits       123180   123076     -104     
- Misses      46502    46544      +42     
+ Partials     5256     5254       -2     

Flag	Coverage Δ
backward-compatibility	0.16% <0.00%> (+<0.01%)	⬆️
db-migration	0.16% <0.00%> (+<0.01%)	⬆️
genesis-check	1.41% <0.00%> (+<0.01%)	⬆️
linux	69.99% <91.54%> (-0.04%)	⬇️
linux-nightly	70.02% <91.54%> (-0.03%)	⬇️
pytests	1.71% <0.00%> (+<0.01%)	⬆️
sanity-checks	1.52% <0.00%> (+<0.01%)	⬆️
unittests	70.21% <91.54%> (-0.04%)	⬇️
upgradability	0.20% <0.00%> (+<0.01%)	⬆️

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