refactor: OPTIC-924: Remove Stale Feature Flag - ff_back_dev_2915_storage_nginx_proxy_26092022_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

Remove long time stale feature flag

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[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 76.71%. Comparing base (cf58e57) to head (b12b72c).
Report is 12 commits behind head on develop.

Files with missing lines	Patch %	Lines
label_studio/core/storage.py	0.00%	2 Missing ⚠️
label_studio/tasks/models.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #6648      +/-   ##
===========================================
+ Coverage    76.68%   76.71%   +0.03%     
===========================================
  Files          169      169              
  Lines        13859    13848      -11     
===========================================
- Hits         10628    10624       -4     
+ Misses        3231     3224       -7     

Flag	Coverage Δ
pytests	76.71% <25.00%> (+0.03%)	⬆️

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[yyassi-heartex]

ahh took me a second to see what happened in models - nice!

[luarmr]

/git merge

Workflow run
Successfully merged: create mode 100644 web/apps/labelstudio/src/components/HeidiTips/hooks.ts