Updates to the conformance test suite

[ehildenb]

Blocked on: runtimeverification/k#4370
Blocked on: #2439

• Update all actions/checkout from v3 => v4 and Gr1N/setup-poetry from v8 => v9 to get rid of NodeJS deprecation warnings on actions runs.
• Updates Poetry to v1.8.3.
• Switch us off the LegacyTests directory in the Ethereum test-suite completely.
• Avoid cloning submodules recursively in almost all cases (saves 1-2min per job or so).
  • Interactive tests in unit/profiling/nix have the files they used copied directly into this repository instead.
  • Conformance test stage still does recursive submodule clone, because it needs the test-suite. In this case, it's still faster to let GH action runner manage the clone with caching.
  • Many stages only recursively clone the plugin submodule manually after doing a non-recursive code checkout.
• Break each conformance test into an individual run, instead of batch-running them. Logging messages for each as well.
• Does not run the VMTests twice (once in BChain tests and once on its own).
• Does not run each conformance test twice (once in normal tests, once in legacy).

[ehildenb]

Before:

After:

[Baltoli]

Blocked on: #2439