Fixed typing issues in the 'conftest' test module that were revealed by Pylance

[tieneupin]

The code works, but Pylance flagged some issues with the way in which the functions were type hinted and the errors were raised. This PR resolves those issues by type hinting and handling errors correctly.

• Use SQLModel and SQLALchemy's respective implementations of select
• Set default value of lookup_kwargs and insert_kwargs to None, then create the empty dictionary within the function.
• raise InterfaceError is not needed
• Use SessionTransaction for type hinting instead of RootTransaction

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.65%. Comparing base (8fb34a2) to head (4358e3f).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #741   +/-   ##
=======================================
  Coverage   46.65%   46.65%           
=======================================
  Files          91       91           
  Lines        9607     9607           
  Branches     1255     1255           
=======================================
  Hits         4482     4482           
  Misses       4912     4912           
  Partials      213      213           

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