Fixed failed place order by Vipps: On Klarna init and on callback

[vmalyk]

Hi!

Pre-conditions
Magento 2.4.1
Klarna Checkout 9.1.5.
Vipps Payment 2.4.6
PHP 7.4

Issues

1. After choose Vipps in Klarna iframe Customer redirects to Cart page with error "An error occurred during request to Vipps. Please try again later. " . It's related with load quote and id is get as string.
2. After fix pt.1, Vipps is initialized fine and after confirm , Customer redirected to checkout/onepage/failure page with message "Ingen slik enhet med entity_id = 11", but after checking vipps_quote - entity is present.

Fixes

1. Added cast to int for quote id, because it's desired type.
2. Related with removed loading and method load always get exception, because $monitoringQuote->getId() is empty in Vipps\Payment\Model\QuoteRepository.

Issue 1 is relevant for 2.3.x versions and I've added PR #89.

Please review,

[ed007m]

@vmalyk
We have fixed this issue in our last release 2.4.7.
Thanks for the input here.