Inline test_db_connection() fn

[Turbo87]

Now that we are more and more using async connections, the test_db_connection() fn isn't all that useful anymore since it always returns a sync connection. We can call these two statements individually instead to make our tests easier to migrate to async connections.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.23%. Comparing base (732b81f) to head (31d72d6).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9976      +/-   ##
==========================================
+ Coverage   89.22%   89.23%   +0.01%     
==========================================
  Files         293      292       -1     
  Lines       30394    30409      +15     
==========================================
+ Hits        27118    27135      +17     
+ Misses       3276     3274       -2     

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