Improve mcmp type comparison

[frouioui]

Description

This Pull Request enhances how we compare types with mcmp. If the type is the same between MySQL and Vitess but the size is bigger on Vitess than on MySQL, we let the test pass.

Related to #15818, it won't fix it but it will allow test to pass.

[vitess-bot]

Review Checklist

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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

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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.
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• If a flag is removed, then it should also be removed from vitess-operator and arewefastyet, if used there.
• 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 68.48%. Comparing base (cf3acaa) to head (62e451c).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15821      +/-   ##
==========================================
+ Coverage   68.41%   68.48%   +0.06%     
==========================================
  Files        1558     1558              
  Lines      196353   197856    +1503     
==========================================
+ Hits       134337   135493    +1156     
- Misses      62016    62363     +347     

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