Add support for auto-detect when a primary key is also a foreign key in Metadata

[gsheni]

• Fixes Metadata should be able to auto-detect cases where a primary key is also a foreign key (column_name_match algorithm) #2788
• This PR adds tests to verify that primary to primary key relationships can be detected and includes docstring fixes.
  • Previously, the primary key was excluded from the column name match via the metadata validation. However, once the metadata validation was updated to allow PK to PK, this enforcement was no present.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.12%. Comparing base (9c67fa0) to head (afe04ac).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2835   +/-   ##
=======================================
  Coverage   98.12%   98.12%           
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  Files          73       73           
  Lines        8177     8177           
=======================================
  Hits         8024     8024           
  Misses        153      153           

Flag	Coverage Δ
integration	75.59% <ø> (+0.07%)	⬆️
unit	97.12% <ø> (ø)

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