Remove feature flag for ABI-only version of EVM contract

[m-Peter]

Closes: #5506

Undo all the changes introduced in #5230

[janezpodhostnik]

This one can be removed too, but that can be done in a different PR.

[m-Peter]

@janezpodhostnik Removed in d95792c

[m-Peter]

That actually needs a more changes to work, as I think the new account for storage does not have keys. I'll leave this for another PR 🙏

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 55.65%. Comparing base (51a3fb6) to head (f4e4fc7).
Report is 71 commits behind head on master.

Files	Patch %	Lines
...edger/migrations/change_contract_code_migration.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5587      +/-   ##
==========================================
- Coverage   55.67%   55.65%   -0.02%     
==========================================
  Files        1037     1037              
  Lines      101404   101393      -11     
==========================================
- Hits        56457    56434      -23     
- Misses      40607    40619      +12     
  Partials     4340     4340              

Flag	Coverage Δ
unittests	55.65% <66.66%> (-0.02%)	⬇️

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