revokeTokens
Revokes the access tokens associated with this external account.
This method invalidates the OAuth tokens that Clerk has stored for this external account. This is useful for security purposes when you want to ensure that stored tokens can no longer be used to access the external provider's API on behalf of the user.
Note: This does not delete the external account itself, only revokes its tokens. The account remains connected but may need reauthorization for future API access.
Return
A ClerkResult containing the updated User object on success, or a ClerkErrorResponse on failure