test: Move state test export procedure to testutils

[chfast]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.47%. Comparing base (44f2c85) to head (fca1128).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1169   +/-   ##
=======================================
  Coverage   94.47%   94.47%           
=======================================
  Files         168      168           
  Lines       17984    17988    +4     
=======================================
+ Hits        16991    16995    +4     
  Misses        993      993           

Flag	Coverage Δ
eof_execution_spec_tests	20.91% <0.00%> (-0.01%)	⬇️
ethereum_tests	27.05% <0.00%> (-0.01%)	⬇️
ethereum_tests_silkpre	19.48% <0.00%> (-0.01%)	⬇️
execution_spec_tests	21.27% <0.00%> (-0.01%)	⬇️
unittests	89.72% <100.00%> (+<0.01%)	⬆️

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Files with missing lines	Coverage Δ
test/statetest/statetest.hpp	87.50% <ø> (ø)
test/statetest/statetest_export.cpp	73.60% <100.00%> (+38.30%)	⬆️
test/unittests/state_transition.cpp	97.40% <100.00%> (-1.24%)	⬇️

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