fix: disable SHOW_STACKTRACE by default

[dpgaspar]

SUMMARY

Pushing for a more secure by default approach, stack traces on error responses are inherently insecure.

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 #24137 (e05443d) into master (0496779) will increase coverage by 0.08%.
The diff coverage is 100.00%.

❗ Current head e05443d differs from pull request most recent head 685c2ba. Consider uploading reports for the commit 685c2ba to get more accurate results

@@            Coverage Diff             @@
##           master   #24137      +/-   ##
==========================================
+ Coverage   68.18%   68.26%   +0.08%     
==========================================
  Files        1952     1952              
  Lines       75393    75393              
  Branches     8204     8204              
==========================================
+ Hits        51403    51469      +66     
+ Misses      21884    21818      -66     
  Partials     2106     2106              

Flag	Coverage Δ
hive	53.23% <100.00%> (?)
mysql	78.94% <100.00%> (+<0.01%)	⬆️
postgres	79.01% <100.00%> (+<0.01%)	⬆️
presto	53.16% <100.00%> (ø)
python	82.81% <100.00%> (+0.18%)	⬆️
sqlite	77.54% <100.00%> (+<0.01%)	⬆️
unit	53.18% <100.00%> (ø)

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Impacted Files	Coverage Δ
superset/config.py	92.02% <100.00%> (ø)

... and 5 files with indirect coverage changes

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[villebro]

LGTM