ContextPropagators lost in TestWorkflowEnvironment

[WellingR]

While enabling a ContextPropagators to include MDC in logging I found that it did not work during my tests.

After some investigation I found out that the TestWorkflowEnvironmentInternal calls WorkflowClientOptions.newBuilder(options). Which creates a copy of the options but without the context propagators.

On first glance fixing this seems as simple as just setting the context propagators in WorkflowClientOptions.