[release-23.0] Properly Strip Keyspace Table Qualifiers in FK Constraints (#18926)

[vitess-bot]

Description

This is a backport of #18926

[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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Backward compatibility

• Protobuf changes should be wire-compatible.
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.72%. Comparing base (89a177d) to head (f3054f1).
⚠️ Report is 1 commits behind head on release-23.0.

Additional details and impacted files

@@               Coverage Diff                @@
##           release-23.0   #18935      +/-   ##
================================================
+ Coverage         69.71%   69.72%   +0.01%     
================================================
  Files              1606     1606              
  Lines            214549   214550       +1     
================================================
+ Hits             149570   149593      +23     
+ Misses            64979    64957      -22     

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