[Feature]: Ensure Fluent v8 and Fluent v9 ShadowDOM implementations work together

[spmonahan]

Library

React / v8 (@fluentui/react)

Describe the feature that you would like added

Ensure that the Shadow DOM updates for Fluent v8 and Fluent v9 interop so that users who rely on both libraries can take advantage of shadow DOM.

Have you discussed this feature with our team

No response

Additional context

• Fluent v8 work: #28058
• Fluent v9 work: #27759

Validations

• [X] Check that there isn't already an issue that request the same feature to avoid creating a duplicate.