refactor(create-new-vault): Replace deprecated TextField with FormTextField

[hash88o]

Description

This PR replaces the deprecated TextField component with the new FormTextField component from the component-library in the create-new-vault component. This is part of the ongoing effort tracked in #20483 to migrate all deprecated TextField instances to the new component-library TextField.

Changes made:

• Replaced TextField import from ui/components/ui/text-field with FormTextField and TextFieldType from ui/components/component-library
• Updated password field props:
  • Changed type="password" to type={TextFieldType.Password}
  • Converted error prop from string to boolean
  • Added helpText prop for error messages
  • Moved data-testid into inputProps
  • Removed unsupported props: margin, largeLabel
• Applied same changes to confirm password field

Changelog

CHANGELOG entry: null

Related issues

Fixes: #20483

Manual testing steps

1. Build the extension with yarn start:test
2. Load the extension in Chrome/Brave
3. Navigate to the "Import wallet" flow
4. Verify the password fields render correctly
5. Test password validation (minimum 8 characters)
6. Test password mismatch validation
7. Verify error messages display properly

Screenshots/Recordings

Before

After

Pre-merge author checklist

• I've followed MetaMask Contributor Docs and MetaMask Extension Coding Standards
• I've completed the PR template to the best of my ability
• I've included tests if applicable
• I've documented my code using JSDoc format if applicable
• I've applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed)
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots

[github-actions]

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[hash88o]

I have read the CLA Document and I hereby sign the CLA