[test] ChainGenesis::new from genesis_config instead of genesis

[shreyan-gupta]

ChainGenesis constructor currently takes the whole genesis as input. We might as well just work with the genesis config.

Further down the line, this would be helpful to change the test environment to store just the genesis_config instead of chain_genesis.

Future plans to only use real epoch manager would benefit as real epoch manager takes genesis_config as input.

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (4b815be) 72.02% compared to head (124563f) 71.99%.

Files	Patch %	Lines
integration-tests/src/genesis_helpers.rs	0.00%	2 Missing ⚠️
tools/speedy_sync/src/main.rs	0.00%	1 Missing ⚠️
tools/state-viewer/src/state_parts.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10591      +/-   ##
==========================================
- Coverage   72.02%   71.99%   -0.03%     
==========================================
  Files         724      724              
  Lines      147205   147205              
  Branches   147205   147205              
==========================================
- Hits       106022   105985      -37     
- Misses      36329    36366      +37     
  Partials     4854     4854              

Flag	Coverage Δ
backward-compatibility	0.08% <0.00%> (ø)
db-migration	0.08% <0.00%> (ø)
genesis-check	1.25% <0.00%> (ø)
integration-tests	37.11% <57.14%> (-0.02%)	⬇️
linux	71.03% <80.95%> (+<0.01%)	⬆️
linux-nightly	71.45% <80.95%> (-0.05%)	⬇️
macos	54.95% <89.47%> (+0.20%)	⬆️
pytests	1.46% <0.00%> (ø)
sanity-checks	1.26% <0.00%> (ø)
unittests	67.89% <89.47%> (-0.02%)	⬇️
upgradability	0.13% <0.00%> (ø)

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