Chore(eth-implicit-account): Test eth-implicit accounts still work with stateless validation

[birchmd]

This PR introduces a new test where eth-implicit accounts are used while stateless validation is enabled.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.77%. Comparing base (9abf20a) to head (a78ca75).

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #11509      +/-   ##
==========================================
- Coverage   71.78%   71.77%   -0.02%     
==========================================
  Files         792      792              
  Lines      162617   162617              
  Branches   162617   162617              
==========================================
- Hits       116734   116712      -22     
- Misses      40837    40854      +17     
- Partials     5046     5051       +5     

Flag	Coverage Δ
backward-compatibility	0.23% <ø> (ø)
db-migration	0.23% <ø> (ø)
genesis-check	1.35% <ø> (ø)
integration-tests	37.90% <ø> (+0.01%)	⬆️
linux	71.29% <ø> (+<0.01%)	⬆️
linux-nightly	71.37% <ø> (-0.01%)	⬇️
macos	53.29% <ø> (-1.27%)	⬇️
pytests	1.58% <ø> (ø)
sanity-checks	1.38% <ø> (ø)
unittests	66.20% <ø> (-0.02%)	⬇️
upgradability	0.27% <ø> (ø)

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[wacban]

LGTM

JFYI The more modern way to implement this test would be to use the test loop but given this is ready I'm not asking you to migrate it ;)