Clean-up remainings of `query constitution-hash`

[palas]

Changelog

- description: |
    Cleaned up remainings of constitution-hash query
# uncomment types applicable to the change:
  type:
  - refactoring    # QoL changes

Context

This is a follow-up of https://github.com/IntersectMBO/cardano-node/pull/5920#discussion_r1707323667

Investigation showed that removal of query constitution-hash was a conscious decision motivated to it no longer being relevant since its functionality is already covered by query constitution:

• Decision to remove it from the era's query:
  • Issue: [cardano-cli] Issue #345
  • PR: [cardano-cli] PR #370
• Decision to remove it from legacy:
  • Issue: [cardano-cli] Issue #503
  • PR: [cardano-cli] PR #515

How to trust this PR

I think the fact that tests pass and that it compiles are pretty telling. Maybe check the context and let me know if you foresee that this removal will have effects somewhere else, but I doubt.

Checklist

• [x] Commit sequence broadly makes sense and commits have useful messages
• [x] New tests are added if needed and existing tests are updated. See Running tests for more details
• [x] Self-reviewed the diff