Refactor the testdappv2 contract to refund the received assets

[lumtis]

Describe the Issue

Currently the testdappv2 contract allows to assert if onCall, onRevert are called, however it doesn't refund the received assets

This is a problem for mainnet live network where real monetary value is sent, these assets should be refunded so we can confidently set any value when running the E2E tests.