Google OAuth signups now persist the same first-party attribution
cookies as email signups on Chatwoot Cloud.
This keeps attribution capture owned by the website and reuses the
existing Enterprise-only account attribution service. The OAuth callback
only records the already-shaped first-touch and last-touch cookie
payload after a new account is created.
## What changed
- Added Enterprise-only attribution persistence to the Google OAuth
signup account creation path.
- Reuses `Internal::Accounts::MarketingAttributionService`.
- Keeps attribution best-effort so failures do not interrupt OAuth
signup.
- Leaves existing email signup and SAML behavior unchanged.
## How to test
- Start from a Chatwoot Cloud-like setup with attribution cookies
present.
- Sign up using the Google OAuth button.
- Confirm the created account has
`internal_attributes['marketing_attribution']` with `first_touch` and
`last_touch`.
- Confirm existing Google OAuth login still redirects normally.
Validation run locally:
- `bundle exec rspec
spec/enterprise/controllers/enterprise/devise_overrides/google_oauth_attribution_spec.rb`
- `bundle exec rspec
spec/controllers/devise/omniauth_callbacks_controller_spec.rb
spec/enterprise/controllers/enterprise/devise_overrides/google_oauth_attribution_spec.rb`
- `bundle exec rubocop
enterprise/app/controllers/enterprise/devise_overrides/omniauth_callbacks_controller.rb
spec/enterprise/controllers/enterprise/devise_overrides/google_oauth_attribution_spec.rb`
