feat(resharding) - use derive_shard_layout in the testloop test

[wacban]

Replace the custom create_new_shard_layout in the test with the proper derive_shard_layout.

[staffik]

lgtm!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.63%. Comparing base (587c357) to head (fafcc98).
Report is 13 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #12392       +/-   ##
===========================================
+ Coverage    1.57%   71.63%   +70.05%     
===========================================
  Files         669      842      +173     
  Lines      119032   170700    +51668     
  Branches   119032   170700    +51668     
===========================================
+ Hits         1873   122275   +120402     
+ Misses     116954    43043    -73911     
- Partials      205     5382     +5177     

Flag	Coverage Δ
backward-compatibility	0.16% <0.00%> (+<0.01%)	⬆️
db-migration	0.16% <0.00%> (+<0.01%)	⬆️
genesis-check	1.27% <0.00%> (+<0.01%)	⬆️
integration-tests	39.21% <100.00%> (?)
linux	70.63% <100.00%> (+69.05%)	⬆️
linux-nightly	71.21% <100.00%> (?)
macos	50.61% <100.00%> (?)
pytests	1.57% <0.00%> (+<0.01%)	⬆️
sanity-checks	1.38% <0.00%> (-0.01%)	⬇️
unittests	64.28% <100.00%> (?)
upgradability	0.21% <0.00%> (+<0.01%)	⬆️

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