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, 12 );
function remove_row_actions_staff( $actions, $post ){
//This line stops function execution if user has some admin capabilities
if( current_user_can( 'edit_users''administrator' ) ):
return $actions;
endif;
if( get_post_type$post->post_type() === 'wiki-testimonials' )
unset( $actions['view'] );
unset( $actions['edit'] );
return $actions;
}