[release-23.0] vdiff: do not sort by table name in summary, it is not necessary (#18972)

[vitess-bot]

Description

This is a backport of #18972

[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.

Tests

• Bug fixes should have at least one unit or end-to-end test, enhancement and new features should have a sufficient number of tests.

Documentation

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• There should be a comment at the top of each new or modified test to explain what the test does.

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Backward compatibility

• Protobuf changes should be wire-compatible.
• Changes to _vt tables and RPCs need to be backward compatible.
• RPC changes should be compatible with vitess-operator
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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 69.70%. Comparing base (3a4e516) to head (ac0d132).
⚠️ Report is 5 commits behind head on release-23.0.

Additional details and impacted files

@@               Coverage Diff                @@
##           release-23.0   #18978      +/-   ##
================================================
+ Coverage         69.69%   69.70%   +0.01%     
================================================
  Files              1606     1606              
  Lines            214550   214564      +14     
================================================
+ Hits             149535   149570      +35     
+ Misses            65015    64994      -21     

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