fix: Update downgrade path for migration to remove sl_tables

[sadpandajoe]

SUMMARY

In #28704 we removed sl_tables however, in the downgrade path there are dependencies on other sl_tables that cause the downgrade to fail.

sl_datasets referenced by sl_dataset_users and sl_dataset_tables
sl_tables referenced by sl_dataset_tables and sl_table_columns
sl_columns referenced by sl_table_columns and sl_dataset_columns

so the new creation order is
sl_datasets
sl_tables
sl_dataset_columns
sl_dataset_users
sl_dataset_tables
sl_table_columns
sl_dataset_columns

Also normalized cases when creating columns since sa.DATETIME() was creating an issue but sa.DateTime() would create the tables without any errors.

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

All modified and coverable lines are covered by tests ✅

Project coverage is 77.51%. Comparing base (76d897e) to head (7c67d28).
Report is 1094 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #28838       +/-   ##
===========================================
+ Coverage   60.48%   77.51%   +17.02%     
===========================================
  Files        1931      518     -1413     
  Lines       76236    37435    -38801     
  Branches     8568        0     -8568     
===========================================
- Hits        46114    29019    -17095     
+ Misses      28017     8416    -19601     
+ Partials     2105        0     -2105     

Flag	Coverage Δ
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javascript	?
mysql	77.21% <ø> (?)
postgres	77.32% <ø> (?)
presto	?
python	77.51% <ø> (+14.03%)	⬆️
sqlite	76.77% <ø> (?)
unit	?

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[Antonio-RiveroMartnez]

lgtm

[mistercrunch]

Oops my bad, thanks for fixing this. I'm pretty sure I tested the downgrade at some point, but maybe I changed something after (?).

I'm thinking it'd be a good thing to add a CI step that tests downgrades.