### Summary
This PR updates the styling of the user full name input field on the
onboarding screen to match the styling of the radio button groups,
creating a more consistent and polished UI.
### Problem
The full name input field in the onboarding form had inconsistent
styling compared to the radio button groups, which created a visually
disjointed user experience.
### Solution
- Created a styled version of `FormTextField` that matches the styling
of radio buttons
- Added proper spacing with a dedicated `InputSection` component
- Removed unnecessary vertical spacing elements
- Ensured consistent typography, sizing, and spacing across form
elements
### Changes
- Added `StyledFormTextField` with custom CSS to match radio button
styling:
- Same font size and weight for labels
- Consistent height, padding, and border-radius
- Full width input field
- Created `InputSection` for consistent vertical spacing
- Replaced original `FormTextField` with the styled version
- Removed redundant `Space` components
### Screenshots
![Before](
<img width="1449" alt="Screenshot 2025-05-22 at 6 50 04 AM"
src="https://github.com/user-attachments/assets/54384e0d-4874-4550-8415-54b15a8e9b13"
/>
) | ![After](
<img width="1452" alt="Screenshot 2025-05-22 at 6 39 38 AM"
src="https://github.com/user-attachments/assets/01b8fd1e-0c47-4d8f-abe7-4f47a31366b6"
/>
)
## Automation
/ok-to-test tags="@tag.Sanity, @tag.Authentication"
### 🔍 Cypress test results
<!-- This is an auto-generated comment: Cypress test results -->
> [!TIP]
> 🟢🟢🟢 All cypress tests have passed! 🎉🎉🎉
> Workflow run:
<https://github.com/appsmithorg/appsmith/actions/runs/15205128744>
> Commit: 6e26d5ad7afef489697362b9202d7fd3be5b63a0
> <a
href="https://internal.appsmith.com/app/cypress-dashboard/rundetails-65890b3c81d7400d08fa9ee5?branch=master&workflowId=15205128744&attempt=1"
target="_blank">Cypress dashboard</a>.
> Tags: `@tag.Sanity, @tag.Authentication`
> Spec:
> <hr>Fri, 23 May 2025 08:33:29 UTC
<!-- end of auto-generated comment: Cypress test results -->
## Communication
Should the DevRel and Marketing teams inform users about this change?
- [ ] Yes
- [ ] No
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **New Features**
- Added a required full name field to the non-super user profiling form,
displayed when cloud billing is enabled.
- **Style**
- Improved input field appearance and adjusted vertical spacing for a
cleaner form layout.
- **Refactor**
- Streamlined form styling by introducing new styled components and
localizing spacing definitions.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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