chore(native_filter): feature on by default

[junlincc]

SUMMARY

This PR is making Dashboard Native_Filter on by default. User will be able to access to this feature without configuring going forward. This feature has been throughout tested and is ready for prime time. In fact, without this feature being visible, user may hit bugs when trying to use the legacy Filterbox along or with Native filter at the same time. This change will also drive users away from using Filterbox which has been causing errors.

NOTE: We will remove this FF for good in about 1 month.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

### TESTING INSTRUCTIONS NA

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• [x ] 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 #16874 (7b5a920) into master (b35645c) will decrease coverage by 0.14%.
The diff coverage is n/a.

❗ Current head 7b5a920 differs from pull request most recent head 461a101. Consider uploading reports for the commit 461a101 to get more accurate results

@@            Coverage Diff             @@
##           master   #16874      +/-   ##
==========================================
- Coverage   77.05%   76.90%   -0.15%     
==========================================
  Files        1021     1021              
  Lines       54693    54693              
  Branches     7457     7457              
==========================================
- Hits        42141    42059      -82     
- Misses      12307    12389      +82     
  Partials      245      245              

Flag	Coverage Δ
hive	?
mysql	81.80% <ø> (-0.04%)	⬇️
postgres	?
presto	81.74% <ø> (-0.01%)	⬇️
python	82.12% <ø> (-0.29%)	⬇️
sqlite	81.52% <ø> (ø)

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

Impacted Files	Coverage Δ
superset/config.py	91.44% <ø> (ø)
superset/db_engines/hive.py	0.00% <0.00%> (-82.15%)	⬇️
superset/sql_validators/postgres.py	50.00% <0.00%> (-50.00%)	⬇️
superset/db_engine_specs/hive.py	69.80% <0.00%> (-16.87%)	⬇️
superset/db_engine_specs/postgres.py	96.49% <0.00%> (-0.88%)	⬇️
superset/views/base_api.py	97.89% <0.00%> (-0.43%)	⬇️
superset/db_engine_specs/presto.py	89.95% <0.00%> (-0.42%)	⬇️
superset/connectors/sqla/models.py	87.01% <0.00%> (-0.24%)	⬇️
superset/utils/core.py	89.84% <0.00%> (-0.13%)	⬇️

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[villebro]

LGTM - rerunning tests to see if it's just flakiness or if some tests need updating

[amitmiran137]

Lets do this!