[Checkout] Set Payment Method and Place Order Mutation

[pmclain]

Description (*)

This matching the existing frontend checkout flow and allows capturing
additional information for fraud tools such as Kount when placing orders.

Fixed Issues (if relevant)

1. [Checkout] Set Payment Method and Place Order Mutation #716

Manual testing scenarios (*)

1. Create empty cart
2. Add product to cart
3. Set billing address (and shipping if cart is not virtual)
4. Set shipping method (if cart is not virtual)
5. Set payment method and place order via mutation

mutation setPaymentMethodAndPlaceOrder($cartId:String!, $methodCode:String!) {
  setPaymentMethodAndPlaceOrder(input: {
      cart_id: $cartId
      payment_method: {
          code: $methodCode
      }
  }) {    
    order {
      order_id
    }
  }
}

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds are green)

[magento-engcom-team]

Hi @naydav, thank you for the review.
ENGCOM-5328 has been created to process this Pull Request
✳️ @naydav, could you please add one of the following labels to the Pull Request?

Label	Description
Auto-Tests: Covered	All changes in Pull Request is covered by auto-tests
Auto-Tests: Not Covered	Changes in Pull Request requires coverage by auto-tests
Auto-Tests: Not Required	Changes in Pull Request does not require coverage by auto-tests

[ghost]

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