chore!: remove ROW_LEVEL_SECURITY feature flag (permanently enable)

[suddjian]

SUMMARY

One of the changes for 2.0

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue: Closes [2.0] Remove ROW_LEVEL_SECURITY feature flag (permanently set to true) #18903
• 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 #19230 (1edc2e0) into master (6828624) will increase coverage by 14.48%.
The diff coverage is 100.00%.

❗ Current head 1edc2e0 differs from pull request most recent head d9ce900. Consider uploading reports for the commit d9ce900 to get more accurate results

@@             Coverage Diff             @@
##           master   #19230       +/-   ##
===========================================
+ Coverage   52.08%   66.57%   +14.48%     
===========================================
  Files        1676     1675        -1     
  Lines       64120    64082       -38     
  Branches     6519     6519               
===========================================
+ Hits        33399    42662     +9263     
+ Misses      29030    19729     -9301     
  Partials     1691     1691               

Flag	Coverage Δ
hive	52.70% <100.00%> (+<0.01%)	⬆️
mysql	81.90% <100.00%> (?)
postgres	81.95% <100.00%> (?)
presto	52.54% <100.00%> (+<0.01%)	⬆️
python	82.38% <100.00%> (+29.41%)	⬆️
sqlite	81.72% <100.00%> (?)

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

Impacted Files	Coverage Δ
superset/config.py	91.41% <ø> (+0.33%)	⬆️
superset/initialization/__init__.py	91.28% <ø> (+1.74%)	⬆️
superset/connectors/sqla/models.py	89.30% <100.00%> (+16.50%)	⬆️
superset/connectors/sqla/views.py	91.05% <100.00%> (+5.45%)	⬆️
superset/security/manager.py	94.74% <100.00%> (+33.45%)	⬆️
...plugins/legacy-plugin-chart-heatmap/src/Heatmap.js	0.00% <0.00%> (ø)
...plugins/legacy-preset-chart-nvd3/src/ReactNVD3.jsx	0.00% <0.00%> (ø)
...ugins/legacy-plugin-chart-calendar/src/Calendar.js	0.00% <0.00%> (ø)
...legacy-plugin-chart-calendar/src/ReactCalendar.jsx	0.00% <0.00%> (ø)
...cy-plugin-chart-calendar/src/vendor/cal-heatmap.js	0.00% <0.00%> (ø)
... and 308 more

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[lyndsiWilliams]

Looks good to me!