Deployment Versioning: Routing AutoUpgrade

When the Current Version for a Deployment changes, already started workflows will transition to the new version if they are AutoUpgrade.

Detailed spec

Create a random deployment name deployment_name
Start a deployment_name.1-0 worker, register workflow type WaitForSignal as AutoUpgrade, the implementation of that workflow should end returning prefix_v1.
Start a deployment_name.2-0 worker, register workflow type WaitForSignal as AutoUpgrade, the implementation of that workflow should end returning prefix_v2.
Set Current version for deployment_name to deployment_name.1-0
Start workflow_1 of type WaitForSignal, it should start AutoUpgrade and with version deployment_name.1-0
Set Current version for deployment_name to deployment_name.2-0
Signal workflow. The workflow (pinned) should exit returning prefix_v2.