Default the UpgradeType for Agent provider to InPlace

By default Agent provider is creating clusters delegating on the CLI, this is not bad, but if you don't define the UpgradeType as a CLI argument it will default to Replace which is basically the focus for cloud providers. We need to default the UpgradeType for Agent provider to InPlace but also respect the option set from the CLI. We also need to check with Kubevirt team what is the desired default.