fix(resharding): split shard twice

[staffik]

In the case a shard is split again, we should use ShardUId prefix of grandparent.
Add a testloop for this scenario. The test is ignored for now, since we currently do not support multiple reshardings without node restart.

[codecov]

Codecov Report

Attention: Patch coverage is 51.35135% with 18 lines in your changes missing coverage. Please review.

Project coverage is 70.48%. Comparing base (9b1e675) to head (db1eb1d).

Files with missing lines	Patch %	Lines
integration-tests/src/test_loop/utils/setups.rs	35.71%	17 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #12635   +/-   ##
=======================================
  Coverage   70.48%   70.48%           
=======================================
  Files         845      845           
  Lines      172247   172279   +32     
  Branches   172247   172279   +32     
=======================================
+ Hits       121405   121434   +29     
- Misses      45743    45746    +3     
  Partials     5099     5099           

Flag	Coverage Δ
backward-compatibility	0.16% <0.00%> (ø)
db-migration	0.16% <0.00%> (ø)
genesis-check	1.36% <0.00%> (-0.01%)	⬇️
linux	69.34% <8.10%> (-0.01%)	⬇️
linux-nightly	70.07% <51.35%> (-0.02%)	⬇️
pytests	1.66% <0.00%> (-0.01%)	⬇️
sanity-checks	1.47% <0.00%> (-0.01%)	⬇️
unittests	70.31% <51.35%> (+<0.01%)	⬆️
upgradability	0.20% <0.00%> (ø)

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