Move jsons to spec-tests repo

[GalRogozinski]

Summary

• Move generated spec-test JSONs to an external spec-tests sibling repo layout.
• Update generators, test loaders, and state-comparison helpers to read/write the new path.
• Extend CI to generate JSONs and sync them to spec-tests via PRs and main-branch merges.

Changes

• Generators now write to ../spec-tests/{qbft,ssv,types} and clean/create those directories.
• Test runners and state-comparison helpers resolve JSONs from the external layout.
• CI:
  • checks out the spec-tests repo
  • on PRs: generates JSONs and opens/updates a matching PR in spec-tests
  • on main: syncs generated JSONs to spec-tests and merges the matching PR if present

CI Requirements

• Repo variable: SPEC_TESTS_REPO (e.g. ssvlabs/spec-tests)
• Secret: SPEC_TESTS_TOKEN (write access to spec-tests)

Notes

• Generated JSONs are now out-of-repo by default; make generate-jsons still works.

[greptile-apps]

Too many files changed for review. (2296 files found, 150 file limit)