feat: Adds a separator to Select All option

[michael-s-molina]

SUMMARY

• Adds a separator to Select All option
• Sorts the controls alphabetically

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

Check that there's a separator between Select All and the other options

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

[geido]

LGTM!

[codecov]

Codecov Report

Merging #22776 (5012b5e) into master (577ac81) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #22776   +/-   ##
=======================================
  Coverage   67.29%   67.29%           
=======================================
  Files        1877     1877           
  Lines       71939    71939           
  Branches     7877     7877           
=======================================
  Hits        48412    48412           
  Misses      21499    21499           
  Partials     2028     2028           

Flag	Coverage Δ
javascript	53.86% <ø> (ø)

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

Impacted Files	Coverage Δ
superset-frontend/src/components/Select/Select.tsx	91.61% <ø> (ø)
superset-frontend/src/components/Select/styles.tsx	80.76% <ø> (ø)

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