Summary:
Rename the YSQL major catalog upgrade related command so they are more unified, and easier to remember.

`upgrade_ysql_major_version_catalog`
`finalize_ysql_major_version_catalog`
`rollback_ysql_major_version_catalog`
`get_ysql_major_version_catalog_state`

Also including a new `finalize_upgrade` command which internally runs `upgrade_ysql_major_version_catalog` (if needed), `promote_auto_flags`, and `upgrade_ysql`.

Fixes #25861
Jira: DB-15156

Test Plan: Jenkins

Reviewers: nikhil

Reviewed By: nikhil

Subscribers: ybase, yql

Differential Revision: https://phorge.dev.yugabyte.com/D41660