VTAdmin: Show Hostname Alongside Tablet ID on tablet selection drop-downs

[niladrix719]

Description

Added hostname alongside tablet Id on VTAdmin tablet selection drop-downs

• using a different text style for the hostname to improve readability
• displaying 'Unknown' when the hostname is missing

Related Issue(s)

Fixes #17954

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

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• Ensure that the Pull Request has a descriptive title.
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[arthurschreiber]

I think this is a very useful change! 👍

[beingnoble03]

LGTM. Tested this locally as well.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.58%. Comparing base (4a0513f) to head (6725f14).
Report is 39 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17982      +/-   ##
==========================================
+ Coverage   67.55%   67.58%   +0.02%     
==========================================
  Files        1597     1598       +1     
  Lines      259907   260084     +177     
==========================================
+ Hits       175586   175770     +184     
+ Misses      84321    84314       -7     

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