test: skip should mark the correct *testing.T

[systay]

Description

When we are inside a t.Run or mcmp.Run, we need to mark the correct t as skipped. Since the mcmp struct contains the *testing.T we are using, we should not use the outer t for skipping.

[vitess-bot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (696fe0e) 67.41% compared to head (58a0a91) 67.63%.
Report is 48 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15333      +/-   ##
==========================================
+ Coverage   67.41%   67.63%   +0.21%     
==========================================
  Files        1560     1561       +1     
  Lines      192752   193535     +783     
==========================================
+ Hits       129952   130901     +949     
+ Misses      62800    62634     -166     

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