fix: RLS new db migration downgrade fails on SQLite

[dpgaspar]

SUMMARY

Fixes #20432 downgrade for SQLite

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 #20449 (bb6d3dd) into master (c79b0d6) will decrease coverage by 0.20%.
The diff coverage is n/a.

❗ Current head bb6d3dd differs from pull request most recent head 0d32c73. Consider uploading reports for the commit 0d32c73 to get more accurate results

@@            Coverage Diff             @@
##           master   #20449      +/-   ##
==========================================
- Coverage   66.72%   66.52%   -0.21%     
==========================================
  Files        1740     1740              
  Lines       65175    65175              
  Branches     6895     6895              
==========================================
- Hits        43486    43355     -131     
- Misses      19940    20071     +131     
  Partials     1749     1749              

Flag	Coverage Δ
hive	?
mysql	82.26% <ø> (ø)
postgres	?
presto	?
python	82.35% <ø> (-0.42%)	⬇️
sqlite	82.12% <ø> (ø)
unit	50.56% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
superset/db_engines/hive.py	0.00% <0.00%> (-85.19%)	⬇️
superset/sql_validators/postgres.py	50.00% <0.00%> (-50.00%)	⬇️
superset/sql_validators/__init__.py	80.00% <0.00%> (-20.00%)	⬇️
superset/db_engine_specs/hive.py	70.22% <0.00%> (-15.65%)	⬇️
superset/db_engine_specs/postgres.py	90.67% <0.00%> (-5.94%)	⬇️
superset/db_engine_specs/presto.py	83.64% <0.00%> (-5.39%)	⬇️
superset/reports/commands/log_prune.py	85.71% <0.00%> (-3.58%)	⬇️
superset/databases/commands/validate_sql.py	92.00% <0.00%> (-2.00%)	⬇️
superset/commands/importers/v1/utils.py	92.20% <0.00%> (-1.30%)	⬇️
superset/connectors/sqla/models.py	89.17% <0.00%> (-1.18%)	⬇️
... and 7 more

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[michael-s-molina]

LGTM