common/compiler, cmd/abigen: remove solc/vyper compiler integration #24936
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Replaces #24935
This PR removes the integration with external compilers (solc, vyper).
The vyper-support in go-ethereum is flaky at best, considering that the vyper compiler itself has been a moving target in the latest years, so I don't believe that our integration works.
The solc compiler might "work", but would probably need some updates (#24925) in order to be more useful.
An alternative path, which this PR does, is remove the support, making it so that we only consume the ABI artefacts, which the compiler spits out. This makes geth more of a component in the pipeline rather than an orchestrator of the pipeline, and lessens the maintenance surface.R