Remove deprecated vtctl commands

[ajm188]

Description

e9aab81093 - These commands were deprecated even before the vtctldclient migration, so they are doubly-safe to remove.

Related Issue(s)

Checklist

• "Backport to:" labels have been added if this change should be back-ported to release branches
• If this change is to be back-ported to previous releases, a justification is included in the PR description
• Tests were added or are not required
• Did the new or modified tests pass consistently locally and on CI?
• Documentation was added or is not required

Deployment Notes

[vitess-bot]

Review Checklist

Hello reviewers! 👋 Please follow this checklist when reviewing this Pull Request.

General

• Ensure that the Pull Request has a descriptive title.
• Ensure there is a link to an issue (except for internal cleanup and flaky test fixes), new features should have an RFC that documents use cases and test cases.

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• vtctl command output order should be stable and awk-able.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.70%. Comparing base (696fe0e) to head (b52a0ea).
Report is 215 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15228      +/-   ##
==========================================
- Coverage   67.41%   65.70%   -1.72%     
==========================================
  Files        1560     1562       +2     
  Lines      192752   193902    +1150     
==========================================
- Hits       129952   127397    -2555     
- Misses      62800    66505    +3705     

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[GuptaManan100]

Something to address in this PR - #14871 (comment)

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