chore(tests): migrate mssql tests to pytest

[villebro]

SUMMARY

Migrate MSSQL engine spec tests from integration tests to new pytest-based unit tests, along with parametrizing all tests that were possible. Also clean up the dttm fixture in the Kusto spec.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #18251 (1e43f62) into master (8c37654) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #18251   +/-   ##
=======================================
  Coverage   66.32%   66.32%           
=======================================
  Files        1592     1592           
  Lines       62569    62569           
  Branches     6295     6295           
=======================================
  Hits        41500    41500           
  Misses      19416    19416           
  Partials     1653     1653           

Flag	Coverage Δ
hive	52.13% <ø> (ø)
mysql	81.25% <ø> (ø)
postgres	81.29% <ø> (ø)
presto	51.97% <ø> (ø)
python	81.73% <ø> (ø)
sqlite	80.99% <ø> (ø)

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