fix(radio): remove deprecated invalid property in favor of group validation

[JinMokai]

fix(radio): remove deprecated invalid property in favor of group validation

Description

Removed the deprecated invalid property from the sp-radio component. Validation state should be managed at the sp-radio-group level.

• Removed invalid property and aria-invalid handling from sp-radio.
• Updated sp-radio-group to reflect the invalid state using the aria-invalid attribute.
• Updated stories to remove the deprecated invalid controls on individual radio buttons.
• Added unit tests to verify aria-invalid toggling on sp-radio-group.

Motivation and context

The invalid property on individual sp-radio elements was deprecated. Standard accessibility and design patterns for radio buttons dictate that validation should occur at the group level rather than on individual options. This change enforces that pattern and ensures the aria-invalid state is correctly applied to the group container.

Related issue(s)

• fixes Remove deprecated support for aria-invalid state on the Radio Component #3571

Screenshots (if appropriate)

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Author's checklist

• I have read the CONTRIBUTING and PULL_REQUESTS documents.
• I have reviewed at the Accessibility Practices for this feature, see: Aria Practices
• I have added automated tests to cover my changes.
• I have included a well-written changeset if my change needs to be published.
• I have included updated documentation if my change required it.

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Reviewer's checklist

• Includes a Github Issue with appropriate flag or Jira ticket number without a link
• Includes thoughtfully written changeset if changes suggested include patch, minor, or major features
• Automated tests cover all use cases and follow best practices for writing
• Validated on all supported browsers
• All VRTs are approved before the author can update Golden Hash

Manual review test cases

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Device review

• Did it pass in Desktop?
• Did it pass in (emulated) Mobile?
• Did it pass in (emulated) iPad?

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Latest commit: fc58d58

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