Bug: Clarify MenuToggle typing for aria-haspopup="true" #12674

Found during testing

With @patternfly/react-core@6.7.0-prerelease.4, MenuToggleProps rejects the string value "true" for aria-haspopup, adding a new TypeScript error in an existing Console usage. Confirm whether this is an intentional breaking type change; if so, document the migration clearly, or preserve compatibility if the string form is intended to remain supported.
Acceptance criteria:

• The supported aria-haspopup values are explicit in the public MenuToggle types and documentation.

• The release notes identify the change and show the supported replacement, if the API change is intentional.

• A consumer using the documented value type-checks successfully.

Jira Issue: PF-4712