Implement half of the TICKF rule.

[lehins]

Description

Copy NEWEPOCH and TICKF relevant functionality from Shelley to Conway.

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

[lehins]

The fix in this PR has been verified on SanchoNet and now released in cardano-ledger-conway-1.6.3.0

[teodanciu]

Looks good to me - same as Shelley TICKF without the MIR, UPEC and GenesisDelegs stuff.
Maybe would be good to have some TODO so we dont' forget about the other half, but there's probably a ticket for it