test(resharding): two independent splits

[staffik]

• test_resharding_v3_two_independent_splits - tests basic scenario where we split two independent shards.
• test_resharding_v3_two_splits_one_after_another_at_single_node - tries to reproduce the scenario that we have in recent forknet test, where one node tracks (first_parent) -> (first_parent_child, second_parent) -> (second_parent_child). (Un)fortunatelly, it passes too.

Double resharding (split child after first resharding) actually needs restarts and is not supported yet in testloop.

[codecov]

Codecov Report

Attention: Patch coverage is 97.95918% with 1 line in your changes missing coverage. Please review.

Project coverage is 70.54%. Comparing base (9d97226) to head (39ccfa7).

Files with missing lines	Patch %	Lines
integration-tests/src/test_loop/utils/setups.rs	96.42%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #12762      +/-   ##
==========================================
+ Coverage   70.51%   70.54%   +0.02%     
==========================================
  Files         846      846              
  Lines      174633   174682      +49     
  Branches   174633   174682      +49     
==========================================
+ Hits       123149   123228      +79     
+ Misses      46262    46229      -33     
- Partials     5222     5225       +3     

Flag	Coverage Δ
backward-compatibility	0.16% <ø> (ø)
db-migration	0.16% <ø> (ø)
genesis-check	1.35% <ø> (?)
linux	68.89% <0.00%> (+0.01%)	⬆️
linux-nightly	70.12% <97.95%> (-0.01%)	⬇️
pytests	1.65% <ø> (+0.18%)	⬆️
sanity-checks	1.46% <ø> (ø)
unittests	70.38% <97.95%> (+<0.01%)	⬆️
upgradability	0.20% <ø> (ø)

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