Fix GetUnresolvedTransactions command for Vtctld

[GuptaManan100]

Description

This PR fixes the bug in GetUnresolvedTransactions wherein we don't show the complete list of participants but omit the metadata manager shard.
This is a forward port for #16949

Related Issue(s)

• RFC: Atomic Distributed Transactions #16245

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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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.40%. Comparing base (538dd4c) to head (75b92d3).
Report is 161 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16961      +/-   ##
==========================================
+ Coverage   68.98%   69.40%   +0.41%     
==========================================
  Files        1562     1570       +8     
  Lines      200690   203982    +3292     
==========================================
+ Hits       138449   141566    +3117     
- Misses      62241    62416     +175     

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