Setup connectivity between Runway workloads and Memorystore (Redis)

What

We need Runway workloads (services & jobs) to be able to connect to their Redis instance. We want isolation to prevent workload A from being able to talk to the redis instance for workload B.

Note: Open thread on Direct VPC egress vs Serverless VPC Access Connector: #354 (comment 2090797983).

Why

For connecting to Redis caching instance from Cloud Run service.