feat: OPTIC-1242: Ask new OSS installs how they found about us

[yyassi-heartex]

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

adding an optional field on signup to ask how the new user heard about Label Studio
updated signup will look like this:

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: label_studio/users/functions.py

Function	Unhandled Issue
save_user	Exception: Unauthorized operation /user/signup/ Event Count: 1

📄 File: label_studio/users/views.py (Click to Expand)

Function	Unhandled Issue
user_signup	Exception: Unauthorized operation /user/signup/ Event Count: 1

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[codecov]

Codecov Report

Attention: Patch coverage is 81.81818% with 2 lines in your changes missing coverage. Please review.

Project coverage is 76.77%. Comparing base (fc49438) to head (8004bea).
Report is 10 commits behind head on develop.

Files with missing lines	Patch %	Lines
label_studio/users/forms.py	88.88%	1 Missing ⚠️
label_studio/users/functions.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #6655   +/-   ##
========================================
  Coverage    76.76%   76.77%           
========================================
  Files          169      169           
  Lines        13865    13876   +11     
========================================
+ Hits         10644    10653    +9     
- Misses        3221     3223    +2     

Flag	Coverage Δ
pytests	76.77% <81.81%> (+<0.01%)	⬆️

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

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[yyassi-heartex]

/git merge develop

Workflow run
Successfully merged: 8 files changed, 26 insertions(+), 72 deletions(-)

[bmartel]

just a print statement to remove, rest looks good!