refactor: remove header signature verification from epoch manager

[stedfn]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 2 lines in your changes missing coverage. Please review.

Project coverage is 70.48%. Comparing base (544fa1f) to head (f78a67d).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
chain/chain/src/chain.rs	80.00%	0 Missing and 1 partial ⚠️
chain/chain/src/validate.rs	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #12467   +/-   ##
=======================================
  Coverage   70.48%   70.48%           
=======================================
  Files         845      845           
  Lines      171976   171970    -6     
  Branches   171976   171970    -6     
=======================================
- Hits       121214   121211    -3     
+ Misses      45654    45651    -3     
  Partials     5108     5108           

Flag	Coverage Δ
backward-compatibility	0.16% <0.00%> (+<0.01%)	⬆️
db-migration	0.16% <0.00%> (+<0.01%)	⬆️
genesis-check	1.28% <0.00%> (+<0.01%)	⬆️
linux	69.37% <85.71%> (-0.02%)	⬇️
linux-nightly	70.06% <85.71%> (+0.01%)	⬆️
pytests	1.59% <0.00%> (+<0.01%)	⬆️
sanity-checks	1.40% <0.00%> (+<0.01%)	⬆️
unittests	70.31% <85.71%> (+<0.01%)	⬆️
upgradability	0.20% <0.00%> (+<0.01%)	⬆️

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