fix(sql_parse): Ignore USE SQL keyword when determining SELECT statement

[john-bodley]

SUMMARY

The USE SQL keyword doesn't invalidate whether the parsed statement(s) represent a SELECT.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

Added unit tests.

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-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.04%. Comparing base (2e5f3ed) to head (29f8e17).
Report is 22 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #28279      +/-   ##
==========================================
+ Coverage   60.49%   70.04%   +9.54%     
==========================================
  Files        1931     1933       +2     
  Lines       76241    76492     +251     
  Branches     8566     8566              
==========================================
+ Hits        46122    53577    +7455     
+ Misses      28015    20811    -7204     
  Partials     2104     2104              

Flag	Coverage Δ
hive	49.21% <83.33%> (+0.05%)	⬆️
mysql	77.57% <83.33%> (?)
postgres	77.67% <83.33%> (?)
presto	53.84% <83.33%> (+0.03%)	⬆️
python	83.26% <100.00%> (+19.77%)	⬆️
sqlite	77.14% <83.33%> (?)
unit	57.72% <100.00%> (+0.10%)	⬆️

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