no issue
- when the role selection was extracted to an external component the limit validation was also extracted but had no way of feeding back to the consumer
- added `onValidationSuccess` and `onValidationFailure` arguments to the role selection component to allow validation feedback to the consumer
- updated staff invite modal with actions to update state based on validation so the modal's buttons can update accordingly
no issue
- initial role was always being set to Contributor due to incorrect argument being used when checking if the default role should be applied
- there was considerable layout shift of the `<GhRoleSelection>` container after role loading was finished, quick-fix applied by specifying a width and height to the loading spinner container that matches the final width/height
