refactor: OPTIC-927: Remove Stale Feature Flag - ff_front_dev_2432_auto_save_polygon_draft_210622_short

[luarmr]

PR fulfills these requirements

• Commit message(s) and PR title follows the format [fix|feat|ci|chore|doc]: TICKET-ID: Short description of change made ex. fix: DEV-XXXX: Removed inconsistent code usage causing intermittent errors
• Tests for the changes have been added/updated (for bug fixes/features)
• Docs have been added/updated (for bug fixes/features)
• Best efforts were made to ensure docs/code are concise and coherent (checked for spelling/grammatical errors, commented out code, debug logs etc.)
• Self-reviewed and ran all changes on a local instance (for bug fixes/features)

Change has impacts in these area(s)

(check all that apply)

• Product design
• Backend (Database)
• Backend (API)
• Frontend

Describe the reason for change

Removing a FF that was stale for a few months.

WHEN REVIEW
CHECK THE STALE VALUE FIRST

[netlify]

✅ Deploy Preview for label-studio-docs-new-theme canceled.

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[netlify]

✅ Deploy Preview for heartex-docs canceled.

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🔨 Latest commit	332738b
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.77%. Comparing base (bdc505c) to head (332738b).
Report is 140 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #6581   +/-   ##
========================================
  Coverage    76.77%   76.77%           
========================================
  Files          170      170           
  Lines        13883    13883           
========================================
  Hits         10659    10659           
  Misses        3224     3224           

Flag	Coverage Δ
pytests	76.77% <ø> (ø)

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[luarmr]

Thanks @yyassi-heartex for pin point
#6584

[luarmr]

/git merge

Workflow run
Successfully merged: create mode 100644 web/libs/editor/src/components/SidePanels/DetailsPanel/TimelineRegionEditor.tsx

[luarmr]

This feature flag is gone