[test] real_epoch_managers doesn't need genesis.config

[shreyan-gupta]

Buildup PRs

#10590
#10591
#10594

Next PR I'll try using the real epoch manager as default and let's see what happens...

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8c34e92) 72.05% compared to head (0da738a) 72.02%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10597      +/-   ##
==========================================
- Coverage   72.05%   72.02%   -0.04%     
==========================================
  Files         725      725              
  Lines      147196   147195       -1     
  Branches   147196   147195       -1     
==========================================
- Hits       106067   106019      -48     
- Misses      36284    36322      +38     
- Partials     4845     4854       +9     

Flag	Coverage Δ
backward-compatibility	0.08% <0.00%> (ø)
db-migration	0.08% <0.00%> (ø)
genesis-check	1.25% <0.00%> (+<0.01%)	⬆️
integration-tests	37.07% <60.00%> (-0.07%)	⬇️
linux	71.05% <100.00%> (+0.04%)	⬆️
linux-nightly	71.47% <100.00%> (-0.06%)	⬇️
macos	55.01% <100.00%> (-0.06%)	⬇️
pytests	1.46% <0.00%> (+<0.01%)	⬆️
sanity-checks	1.26% <0.00%> (+<0.01%)	⬆️
unittests	67.93% <100.00%> (-0.01%)	⬇️
upgradability	0.13% <0.00%> (ø)

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