fix(sqllab): Do not strip comments when executing SQL statements

[john-bodley]

SUMMARY

Man, the SQL Lab execution/parsing logic is a real rabbit warren—so many methods and diversions to execute SQL.

#27725 attempted to remove stripping comments when executing queries in SQL Lab, however it likely wasn't suffice. #28363 (which also preventing stripping of comments in Explore) remedied this, however it was later reverted in #28567.

The original issue with #27725 is it seems like the SQL is pre-processed/rendered in the command prior to the typical SQL Lab execution logic via Celery et al. This PR simply ensures that comments are never stripped within the context of SQL Lab. This change shouldn't cause the issue surfaced in #28567.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

CI. The relevant tests were updated using logic from #28363.

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

All modified and coverable lines are covered by tests ✅

Project coverage is 83.73%. Comparing base (76d897e) to head (d27b3e8).
Report is 1094 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #29248       +/-   ##
===========================================
+ Coverage   60.48%   83.73%   +23.24%     
===========================================
  Files        1931      518     -1413     
  Lines       76236    37541    -38695     
  Branches     8568        0     -8568     
===========================================
- Hits        46114    31435    -14679     
+ Misses      28017     6106    -21911     
+ Partials     2105        0     -2105     

Flag	Coverage Δ
hive	48.94% <ø> (-0.23%)	⬇️
javascript	?
mysql	77.23% <ø> (?)
postgres	77.34% <ø> (?)
presto	53.55% <ø> (-0.25%)	⬇️
python	83.73% <ø> (+20.24%)	⬆️
sqlite	76.80% <ø> (?)
unit	59.24% <ø> (+1.61%)	⬆️

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[rusackas]

a real rabbit warren

... I think this is the first time I've ever heard someone use the correct nomenclature with this expression.