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You can add a condition on capabilities in order to exclude the admin from the unset action for example

add_filter( 'post_row_actions', 'remove_row_actions', 10, 1 );
function remove_row_actions_staff( $actions ){
  //This line stop function execution if user has some admin capabilities 
  if( current_user_can( 'edit_users' ) ):
    return;
   endif; 

  if( get_post_type() === 'wiki-testimonials' )
    unset( $actions['view'] );
    unset( $actions['edit'] );
  return $actions;
}