deleteOrderItems mutation

[kidunot89]

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What does this implement/fix? Explain your changes.

Implements deleteOrderItems mutation.

NOTE: User cap requirements are the same and createOrder and updateOrder.

• OrderMutationsTest updated.

Example usage

mutation deleteOrderItems( $input: DeleteOrderItemsInput! ) {
    DeleteOrderItems( input: $input ) {
        clientMutationId
        order {
            ...order fields
        }
    }
}

DeleteOrderItemsInput definition

'clientMutationId' => array(
	'type'        => array( 'non_null' => 'String' ),
	'description' => __( 'Unique ID for mutation', 'wp-graphql-woocommerce' ),
),
'id'      => array(
	'type'        => 'ID',
	'description' => __( 'Order global ID', 'wp-graphql-woocommerce' ),
),
'orderId' => array(
	'type'        => 'Int',
	'description' => __( 'Order WP ID', 'wp-graphql-woocommerce' ),
),
'itemIds' => array(
	'type'        => array( 'list_of' => 'Int' ),
	'description' => __( 'ID Order items being deleted', 'wp-graphql-woocommerce' ),
),

Does this close any currently open issues?

…

Any relevant logs, error output, GraphiQL screenshots, etc?

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Any other comments?

…

Where has this been tested?

Operating System: Ubuntu 18.04

WordPress Version: 5.2