feat: Adds the CROSS_REFERENCE feature flag

[michael-s-molina]

SUMMARY

• Adds the CROSS_REFERENCE feature flag
• Sorts the features flags alphabetically in the files
• Adds the PLEASE KEEP THE LIST SORTED ALPHABETICALLY comments for developers

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 #21708 (96da926) into master (7b66e0b) will not change coverage.
The diff coverage is n/a.

❗ Current head 96da926 differs from pull request most recent head d37eff2. Consider uploading reports for the commit d37eff2 to get more accurate results

@@           Coverage Diff           @@
##           master   #21708   +/-   ##
=======================================
  Coverage   66.85%   66.85%           
=======================================
  Files        1799     1799           
  Lines       68875    68875           
  Branches     7319     7319           
=======================================
  Hits        46044    46044           
  Misses      20944    20944           
  Partials     1887     1887           

Flag	Coverage Δ
javascript	53.15% <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	91.61% <ø> (ø)

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