Remove RETURNCONTRACT validation tests

[gumb0]

These tests are migrated to EEST in ethereum/execution-spec-tests#647

(To keep them here we would need to support "initcode" flag in EOF validation tests, and it seems not worth the effort to do it at this point, it's easier to just remove).

[winsvega]

we have introduced coverage checkup. if you add converted json files to ethereum-converte-tests file in pyspecs. it will measure the coverage of eof tests on pyspec version vs this .json you are about to remove, please try it out.

[chfast]

we have introduced coverage checkup. if you add converted json files to ethereum-converte-tests file in pyspecs. it will measure the coverage of eof tests on pyspec version vs this .json you are about to remove, please try it out.

This doesn't work: https://github.com/ethereum/execution-spec-tests/actions/runs/9715118299

[winsvega]

again?
ethereum/execution-spec-tests#657

[chfast]

again? ethereum/execution-spec-tests#657

This is not merged? 🤷

[chfast]

@winsvega Can you make an example migration PR? It looks you made a tool for migration but it is untested.

[winsvega]

You mean the coverage?
Its in pyspec repo closed PRs titled TEST
ethereum/execution-spec-tests#656

[winsvega]

again? ethereum/execution-spec-tests#657

This is not merged? 🤷

I can't merge without review.

You can just add these changes to your pr.

[chfast]

You can just add these changes to your pr.

I did, but it seems the evmone used is out of date. I'm not sure how to read this report.

[winsvega]

the coverage check didn't complete, but its eof tests so let it go.

Error: Contents of /home/travis/build/ethereum/tests/src/EOFTestsFiller/efValidation/EOF1_returncontract_valid_Copier.json is empty. Trying to parse empty file. (forgot --filltests?) (EOFTests/efValidation/EOF1_returncontract_valid_Copier, step: CheckFiller)
Error: 
Error when parsing file (/home/travis/build/ethereum/tests/src/EOFTestsFiller/efValidation/EOF1_returncontract_valid_Copier.json) Contents of /home/travis/build/ethereum/tests/src/EOFTestsFiller/efValidation/EOF1_returncontract_valid_Copier.json is empty. Trying to parse empty file. (forgot --filltests?) 

the source and the generated test files must be removed.

[gumb0]

the source and the generated test files must be removed.

fixed