chore: add debug to tables endpoint

[betodealmeida]

SUMMARY

Add some temporary logging to troubleshoot a problem where tables is returned as a list of lists, for some reason.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

N/A

TESTING INSTRUCTIONS

N/A

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 #19928 (803a861) into master (1ebdaac) will decrease coverage by 0.00%.
The diff coverage is 66.66%.

❗ Current head 803a861 differs from pull request most recent head 55dab89. Consider uploading reports for the commit 55dab89 to get more accurate results

@@            Coverage Diff             @@
##           master   #19928      +/-   ##
==========================================
- Coverage   66.53%   66.53%   -0.01%     
==========================================
  Files        1715     1715              
  Lines       65060    65066       +6     
  Branches     6723     6723              
==========================================
+ Hits        43289    43292       +3     
- Misses      20060    20063       +3     
  Partials     1711     1711              

Flag	Coverage Δ
hive	52.89% <0.00%> (-0.01%)	⬇️
mysql	81.94% <66.66%> (-0.01%)	⬇️
postgres	81.98% <66.66%> (-0.01%)	⬇️
presto	52.74% <0.00%> (-0.01%)	⬇️
python	82.40% <66.66%> (-0.01%)	⬇️
sqlite	81.75% <66.66%> (-0.01%)	⬇️
unit	?

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Impacted Files	Coverage Δ
superset/views/core.py	77.01% <66.66%> (-0.05%)	⬇️
superset/initialization/__init__.py	91.37% <0.00%> (-0.35%)	⬇️

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[eschutho]

@betodealmeida do you think we still need this?

[betodealmeida]

I'll keep it open just in case (since the tests are green :-P ), if #19930 solves the problem I'll close this PR.