[test] TestEnvBuilder takes genesis_config as input

[shreyan-gupta]

This schema makes way more sense for the TestEnv::builder() to take the genesis_config instead of chain_genesis.

Note that real_epoch_manager requires a genesis_config which in a future PR we can directly supply from the test environment builder.

[Longarithm]

Great stuff

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (748448a) 71.98% compared to head (527d9ad) 72.02%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10594      +/-   ##
==========================================
+ Coverage   71.98%   72.02%   +0.03%     
==========================================
  Files         724      725       +1     
  Lines      147208   147196      -12     
  Branches   147208   147196      -12     
==========================================
+ Hits       105975   106011      +36     
+ Misses      36375    36331      -44     
+ Partials     4858     4854       -4     

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	37.06% <52.38%> (+<0.01%)	⬆️
linux	71.07% <100.00%> (+0.04%)	⬆️
linux-nightly	71.44% <100.00%> (+0.01%)	⬆️
macos	55.01% <100.00%> (+0.02%)	⬆️
pytests	1.46% <0.00%> (-0.01%)	⬇️
sanity-checks	1.26% <0.00%> (-0.01%)	⬇️
unittests	67.92% <100.00%> (+0.01%)	⬆️
upgradability	0.13% <0.00%> (ø)

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