[Split PE] Implement Split PE for APMs in the block checkout

[a-danae]

Acceptance criteria

• When multiple payment method types are enabled, they must appear as different payment gateways in the classic checkout, as it happens when PE is disabled. Design xVAk98kbRKUByVTrhPc98g-fi-342_8806
• If already implemented before working on this, payment processing must also continue to work for APMs
• Changes must be covered by tests
• e2e tests must be adjusted to at least maintain the same coverage they had before split PE

Notes

This might be handled in #2784. Confirm before grabbing this issue.

[james-allan]

#2820 adds support for EU APMs (giropay, bancontact, iDEAL, EPS etc). I still need to add support for Latin American payment methods like Oxxo and Boleto.

[a-danae]

Closing as fixed by #2789 and #2820