## Context
Changes here aren't public facing - we're just shifting some internal
only fields on the new project page to consolidate them into the
"internal-only" collapsible
Mainly to improve clarity from our POV RE what fields do users see and
the general look of the new project form
<img width="727" height="558" alt="image"
src="https://github.com/user-attachments/assets/7d8f2915-3a81-4d9d-a067-cd45c1725726"
/>
So everything that's not within the collapsible are essentially fields
that users will see on prod. The changes here also subsequently
deprecates the use of 2 feature flags on the new project page:
- `showPostgresVersionSelector` -> replaced by new flag
`newProjectInternalOnlyConfiguration`
- `enableFlyCloudProvider` -> was used to control the visibility of the
cloud provider field, now replaced by
`newProjectInternalOnlyConfiguration`
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Refactor**
* Reorganized project creation form layout and field ordering for
improved structure.
* Updated project resume flow with refined confirmation modal UI.
* Simplified cloud provider selection interface.
* Streamlined high-availability configuration presentation.
<!-- review_stack_entry_start -->
[](https://app.coderabbit.ai/change-stack/supabase/supabase/pull/45873)
<!-- review_stack_entry_end -->
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
## Problem
We used to have a `_Shadcn_` suffix for all the shadcn form components
because we also had `formik` form components.
This is not needed anymore.
## Solution
- Remove the suffix
- Update all usages
