feat: use-create-lead-form-for-self-hosted

[Zaimwa9]

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• I have added information to docs/ if required so people know about the feature!
• I have filled in the "Changes" section below?
• I have filled in the "How did you test this code" section below?
• I have used a Conventional Commit title for this Pull Request

Changes

This PR aims to harmonize how we capture lead between self_hosted and saas into hubspot.

These flows are valid when the consent checkbox is ticked.

Before

• On lead user signup -> POST /api/v1/onboarding/request/send/
• send_onboarding_request_to_saas_flagsmith_task is dispatched, sending a request to our flagsmith SaaS instance
• SaaS receives request and calls create_self_hosted_onboarding_lead
• GetOrCreate company in hubspot
• Calls hubspot contact API directly to create user with company association

After
One of the goal is to entirely rely on Hubspot to deal with the company creation/association (based on user domain name)

• On lead user signup -> POST /api/v1/onboarding/request/send/ including hubspotutk cookie for attribution
• send_onboarding_request_to_saas_flagsmith_task is dispatched, sending a request to our flagsmith SaaS instance without organisation data but with cookie
• SaaS receives request and calls create_self_hosted_onboarding_lead
• User entity is created and create_lead_form is send, along with hubspot cookie and the correct form id

How did you test this code?

Please describe.

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
flagsmith-frontend-preview	Ready	Preview	Comment	Oct 13, 2025 10:24am
flagsmith-frontend-staging	Ready	Preview	Comment	Oct 13, 2025 10:24am

1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
docs	Ignored	Preview		Oct 13, 2025 10:24am

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-6117	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-6117	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-6117	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-6117	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-6117	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-6117	Finished ✅	Results ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.00%. Comparing base (57f0e97) to head (7aef429).
⚠️ Report is 12 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6117   +/-   ##
=======================================
  Coverage   97.99%   98.00%           
=======================================
  Files        1278     1278           
  Lines       44927    44983   +56     
=======================================
+ Hits        44028    44084   +56     
  Misses        899      899           

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