feat: DIA-787: Add Zendesk widget

[yyassi-heartex]

PR fulfills these requirements

• [x] 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.)
• [x] 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)
• [x] Frontend

Describe the reason for change

Add Zendesk widget integration to allow interaction with customer support

[netlify[bot]]

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

Name	Link
🔨 Latest commit	6877123dcb1084d493981bd89fb21bde17dfced2
🔍 Latest deploy log	https://app.netlify.com/sites/label-studio-docs-new-theme/deploys/657b4c8dd21727000877d234

[netlify[bot]]

✅ Deploy Preview for heartex-docs canceled.

Name	Link
🔨 Latest commit	6877123dcb1084d493981bd89fb21bde17dfced2
🔍 Latest deploy log	https://app.netlify.com/sites/heartex-docs/deploys/657b4c8d5e8dd500089dacc7

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 76.12%. Comparing base (3ef3d8d) to head (6877123). Report is 768 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #5199   +/-   ##
========================================
  Coverage    76.11%   76.12%           
========================================
  Files          154      154           
  Lines        12819    12819           
========================================
+ Hits          9757     9758    +1     
+ Misses        3062     3061    -1     

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[robot-ci-heartex]

This PR is stale because it has been open 45 days with no activity. Remove stale label or comment or this will be closed in 10 days.

[robot-ci-heartex]

This PR is stale because it has been open 45 days with no activity. Remove stale label or comment or this will be closed in 10 days.

[yyassi-heartex]

closing old PR