Move genesis hash to hash genesis-file

[palas]

Changelog

- description: |
    Moved `genesis hash` command to `hash genesis-file`
  type:
  - breaking

Context

This command was only accessible under era specific sub-commands, but itself is era independent. So this PR moves it to the hash subcommand, which is era independent.

How to trust this PR

Changes to golden files are most significative. The most important thing is probably the code remains the same in the new location, but it was copied. Then make sure the new command name is appropriate, and that you are happy with the old command locations not being available anymore.

Checklist

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

[smelc]

Code LGTM so I'm approving but I'm wondering if we should leave the old command and just have it output era genesis hash is deprecated, please use hash genesis-file to be nice to users. And then only after the next release we remove it altogether. This is how we proceeded in the past.

cc @CarlosLopezDeLara