Enhance ValidatedInputControl to delay email validation until blur - #79518

What?

Closes #79515

This PR adds a revalidateOn prop to ValidatedInputControl and defaults it to 'blur' for email input types, preventing noisy validation errors from displaying while the user is actively typing.

Why?

Currently, validated email fields display error messages (e.g., "Please include an @ in the email address") continuously while a user is typing a new email address. This creates a noisy and premature validation UX because partial email addresses are expected to be invalid while being typed.

Aligning with form design best practices (NNG, Baymard, GOV.UK), this change ensures we don't present inline validation errors before the user has finished entering their information.

How?

1. Added a revalidateOn?: 'change' | 'blur' property to ValidatedControlProps and surfaced it through ValidatedInputControl and DataViews' ValidatedText.
2. In ValidatedInputControl, the revalidateOn property defaults to 'blur' if the field type === 'email'.
3. In ControlWithError, we intercept the child component's onChange event via cloneElement to temporarily hide existing validation error messages and unset the isTouched state whenever revalidateOn is 'blur' and the user interacts with the input. The existing onBlur behavior correctly handles the re-validation once focus is lost. Intercepting onChange within React prevents synthetic event batching issues that happen if we use native addEventListener('input').

Testing Instructions

1. Run npm run storybook:dev.
2. Open Components / Selection & Input / Validated Form Controls / ValidatedInputControl.
3. Set the type control to email.
4. Make sure required is enabled.
5. Focus the empty field, then blur it to see the initial validation error.
6. Focus the field again and start typing an email address.
7. Verify that the validation error hides immediately when you begin typing.
8. Verify that it checks validity again and presents the proper error state once you blur the field.

Testing Instructions for Keyboard

1. Navigate to the Storybook field using the Tab key.
2. Tab away while empty to trigger the error.
3. Shift + Tab back into the field and type a letter. The error should visually clear and announce correctly based on standard Aria live region behaviors.
4. Tab away with an invalid partial email and confirm the error message returns.

Use of AI Tools

This PR was authored with the assistance of an Gemini 3.1 Pro using Google Antigravity. It was used to find the relevant files and ensure nothing else breaks.