## Context
There's 2 areas of the dashboard that has the project creation flow -
and this PR consolidates both to use the same UI components to minimise
duplication + keep things consistent
### Before
<img width="1920" height="957" alt="image"
src="https://github.com/user-attachments/assets/2a7ab79d-71c7-43f2-925b-1e1666cc3a69"
/>
### After
<img width="1389" height="957" alt="image"
src="https://github.com/user-attachments/assets/f8465568-af99-46eb-80ee-7ac345383231"
/>
## Changes involved
- What this means for the project creation flow for Vercel Integration:
- Smart region can be selected
- Compute size can be selected
- Enable Data API can be checked
- Automatic RLS enable can be checked
- How it differs from the main project creation flow on `new/slug`
- Organization selection is disabled (cannot be changed)
- The following UI is hidden:
- "Internal configuration" section
- "GitHub repository" field
- "Free project info" at the bottom
- "Cancel" button
Eventually we could looking into reducing the differences more, e.g
having data seeding for both ways, and showing GitHub repository field
for Vercel integration
Resolves DEPR-616
Resolves FE-3905
## To test
Tbh, I'm not really sure how you'd be able to test the vercel
integration locally or on staging, this seemingly can only be done when
changes land on prod.
- What I'd do however is to just test the project creation flow
minimally by landing on
`/integrations/vercel/_/deploy-button/new-project`
- Project creation can work, but just not the connection creation part
- And also test project creation on `/new/slug` as well
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
## Summary by CodeRabbit
* **New Features**
* Added “Create sample tables with seed data” during project creation.
* Enhanced Vercel integration setup with a guided creation flow and
post-creation connection step.
* Added an option to disable organization selection in specialized
flows.
* Added support for triggering a callback after successful project
creation.
* Added support for hiding the Cancel button in specialized flows.
* **UI Improvements**
* Refined the connected GitHub repository selector button/dropdown
visuals.
* Improved security options behavior for different project creation
contexts.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
