Add property for context propagation to the health checks

[Martin Stefanko]

Because we use Mutiny Unis to invoke health checks, the context (CDI for instance) is not propagated on each subscription to the Uni but only at the time the Uni is created. So in this sense, it is impossible to use for instance RequestScoped beans. The solution would be to add an option to recreate health checks unis on every health call. We will make this switchable with config property.