[Sales] add getMailer and Email-Queues

[Hanmac]

Description (*)

• adds getMailer helper function to be easier overwritten.
• also adds Email-Queue for other Sales related E-Mails.

While touching this part, maybe we could discuss other Sales E-Mails related ideas?

• like sending Invoice and Shipment E-Mails to their E-Mail in their order_address? (instead/in addition)?

Related Pull Requests

• see OpenMage/magento-lts#<issue_number>

Fixed Issues (if relevant)

• fixes OpenMage/magento-lts#<issue_number>

Manual testing scenarios (*)

1. ...
2. ...

Questions or comments

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All automated tests passed successfully (all builds are green, SonarCloud checks are not required to merge)

[Hanmac]

@sreichel i'm curious about this part:

$paymentBlock = Mage::helper('payment')->getInfoBlock($order->getPayment())

and their ignored errors:

Parameter #1 $info of method Mage_Payment_Helper_Data::getInfoBlock() expects Mage_Payment_Model_Info, Mage_Sales_Model_Order_Payment|false given.

But shouldn't this cause a big PHP Error crash?
Or do i miss something there?

Edit: I'm dumb, Mage_Sales_Model_Order_Payment extends Mage_Payment_Model_Info, it complains about the possible false

[sonarqubecloud]

Quality Gate failed

Failed conditions
26.1% Duplication on New Code (required ≤ 3%)

See analysis details on SonarQube Cloud