[Issue] Zero payment Order processing status fix

[m2-assistant[bot]]

This issue is automatically created based on existing pull request: magento/magento2#28513: Zero payment Order processing status fix

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Description (*)

Current PR extends Free payment method class to set correct order status if status selected as processing and "auto create invoices" set to NO

Manual testing scenarios (*)

1. Update Zero Subtotal Checkout Method configuration in admin to use status Processing and automatically invoice items to NO
   2. Finish order with no payment required, easiest way is create coupon with 100% discount and use free shipping
   3. Check newly create order status is processing, actual result pending

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)

[m2-assistant[bot]]

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[engcom-Delta]

Issue is not reproducible on 2.4-develop when New Order Status=Processing and Automatically Invoice All items=Yes Was checked case:

1. Navigate to Stores / Configuration / Sales / Payment Methods and select Zero Subtotal Checkout
2. Change New Order status to Processing and Automatically Invoice All items to Yes
3. Create a Product with a price 10$ for example
4. Navigate to Marketing / Cart Price Rules / Add New Rule
5. Create a rule that will cover the cost of the product and shipping
6. Create an order with Zero subtotal using this Rule
7. Navigate to Sales / Orders and verify the status of the order Result: :heavy_check_mark: Order status is Processing