Remove maxMajorPV from Globals

[Lucsanszky]

Description

Resolves #3682

Checklist

• Commit sequence broadly makes sense and commits have useful messages
• New tests are added if needed and existing tests are updated
• When applicable, versions are updated in .cabal and CHANGELOG.md files according to the
  versioning process.
• The version bounds in .cabal files for all affected packages are updated. If you change the bounds in a cabal file, that package itself must have a version increase. (See RELEASING.md)
• All visible changes are prepended to the latest section of a CHANGELOG.md for the affected packages. New section is never added with the code changes. (See RELEASING.md)
• Code is formatted with fourmolu (use scripts/fourmolize.sh)
• Cabal files are formatted (use scripts/cabal-format.sh)
• hie.yaml has been updated (use scripts/gen-hie.sh)
• Self-reviewed the diff

[Lucsanszky]

@nfrisby if I understand correctly, this should not be merged until some of the concerns you mention here are addressed, right? Especially the obsolete node checks part as this PR would remove the protocol version check from chainChecks (which would be okay I guess if we decide to ban intra-era hard forks at some point).

[lehins]

@Lucsanszky Feedback from consensus folks:

The idea would be for the ledger PR to remove maxMajorPV from Globals, but not from chainChecks

The only reason why you had to remove Version from chainChecks is because we used maxMajorPV from Globals for chainChecks in shelley test.

[lehins]

Other than cardano-ledger-core version this PR is good to go.