Test | Convert TvpQueryHintsTests to xunit assertions.

[mdaigle]

Refactors the TVP query hints tests to replace the legacy baseline-based test with modern, assertion-based tests. Removes baseline files and the shared TvpTest helper.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.03%. Comparing base (3303d80) to head (af1f0f1).
⚠️ Report is 4 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (3303d80) and HEAD (af1f0f1). Click for more details.

HEAD has 2 uploads less than BASE

Flag	BASE (3303d80)	HEAD (af1f0f1)
CI-SqlClient	2	0

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4002      +/-   ##
==========================================
- Coverage   74.38%   65.03%   -9.36%     
==========================================
  Files         287      282       -5     
  Lines       43982    66073   +22091     
==========================================
+ Hits        32717    42971   +10254     
- Misses      11265    23102   +11837     

Flag	Coverage Δ
CI-SqlClient	?
PR-SqlClient-Project	65.03% <ø> (?)

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