Remove call to nest_asyncio.apply in server startup

[charlesbluca]

Attempting to unblock some issues starting up the server with run_server(blocking=True) reported by @randerzander; seems like these crop up when we attempt to patch the event loop, interested in how CI will respond to us removing this patch.

[codecov-commenter]

Codecov Report

Merging #1048 (7d5ac33) into main (26fbe16) will increase coverage by 0.11%.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##             main    #1048      +/-   ##
==========================================
+ Coverage   81.31%   81.42%   +0.11%     
==========================================
  Files          78       78              
  Lines        4373     4372       -1     
  Branches      786      786              
==========================================
+ Hits         3556     3560       +4     
+ Misses        644      635       -9     
- Partials      173      177       +4     

Impacted Files	Coverage Δ
dask_sql/server/app.py	100.00% <100.00%> (ø)
dask_sql/_version.py	35.31% <0.00%> (+1.41%)	⬆️

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[ayushdg]

Does this unblock a few tests?

[charlesbluca]

Don't think this has an impact on the server tests since those are accessing the server through the fastapi.testclient.TestClient and so we don't actually start up a uvicorn server; not sure if there's any larger reasoning behind the decision to use the TestClient there but could be worthwhile to explore actually spinning up and shutting down a server for the tests to make sure things work as expected there.

Should also note that some of the failures are pretty trivial, and just come down to differences in the expected column / dtype names, if we begin pushing on updating server support those shouldn't be too difficult to get passing again.