Fix false positive tests in ksp-codegen by correcting assertContainAll logic

[justdeok]

Summary

Fixed a logic error in assertContainAll where it was validating the expected string against itself instead of the actual output.

Key Changes

• Corrected the receiver in assertContainAll from other to this.
• Updated mismatched tests accordingly.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (115ed29) to head (5099b57).
⚠️ Report is 23 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #1573    +/-   ##
=======================================
  Coverage    0.00%   0.00%            
=======================================
  Files         813     838    +25     
  Lines       31466   31795   +329     
  Branches     3614    3622     +8     
=======================================
- Misses      31466   31795   +329     

Flag	Coverage Δ
cubrid	0.00% <ø> (?)
db2	0.00% <ø> (?)
embedded	0.00% <ø> (?)
examples	0.00% <ø> (?)
firebird	0.00% <ø> (?)
mongodb	0.00% <ø> (?)
mysql	0.00% <ø> (?)
oracle	0.00% <ø> (?)
postgresql	0.00% <ø> (?)
test	0.00% <ø> (ø)

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