KMS integration tests should be run as part of the CI

[sideninja]

We should make sure the KMS integration is working at all the times, as it likely will be used in critical situations (transaction signing services) and likely in production environments (since this is the secure and suggested way of signing transactions in production).
Our current KMS integration tests are not run as part of the CI and are possible to run manually and locally, relying on the developer to do so regularly. This can lead to outdated and broken implementation of the KMS.