eof: Disable gasTests for EOF

[rodiazet]

gasTests are supposed to be run not via IR. As long as they are run this way they cannot be compiled to EOF.

• Make GasTest supports bytecodeFormat flag and mark them all to run only for current EVM version
• Enable excluded earlier gasTests in CI testing for EOF.
• Add bytecodeFormat: legacy flag to gasTests

[cameel]

For now disabling those on EOF is ok. But the PR needs a few adjustments because the way it is now, it seems to me that the EVM and EOF versions from the test settings will get ignored. I'm actually not sure how these tests even pass without that.

Eventually we should either make them work via-IR with and without EOF or just get rid of them if they're not worth converting. But that's something for later.