[VTAdmin] Cherry Pick Topology Browser

[notfelineit]

Description

This PR cherry-picks #11496

Related Issue(s)

See #11496

Checklist

• "Backport me!" label has been added if this change should be backported
• Tests were added or are not required
• Documentation was added or is not required

Deployment Notes

N/A

[vitess-bot]

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[deepthi]

Not sure why the backup upgrade/downgrade test failed. There is nothing in this PR related to backups at all.
I'm going to override and merge and we'll see if it starts failing on other PRs. If it does, we'll need to debug and fix.

[vitess-bot]

I was unable to backport this Pull Request to the following branches: release-15.0.