feat: Adds the HORIZONTAL_FILTER_BAR feature flag

[michael-s-molina]

SUMMARY

Adds the HORIZONTAL_FILTER_BAR feature flag under the Development category.

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 #21935 (2a542b7) into master (fa67315) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #21935   +/-   ##
=======================================
  Coverage   66.95%   66.95%           
=======================================
  Files        1807     1807           
  Lines       69182    69182           
  Branches     7402     7402           
=======================================
  Hits        46319    46319           
  Misses      20952    20952           
  Partials     1911     1911           

Flag	Coverage Δ
hive	52.92% <ø> (ø)
javascript	53.38% <ø> (ø)
mysql	78.37% <ø> (ø)
postgres	78.43% <ø> (ø)
presto	52.82% <ø> (ø)
python	81.49% <ø> (ø)
sqlite	76.92% <ø> (ø)
unit	51.06% <ø> (ø)

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

Impacted Files	Coverage Δ
...ackages/superset-ui-core/src/utils/featureFlags.ts	100.00% <ø> (ø)
superset/config.py	91.69% <ø> (ø)

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[kgabryje]

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