Workload deployment replica counts cannot be read from telemetry

[ecv]

Compute publishes the status conditions of every workload deployment, so an operator can see that one is not available. Nothing publishes how many replicas it actually has against how many it wants.

A deployment stuck at two of five ready and one stuck at zero of five look identical from outside. Neither can be charted, and neither can be alerted on by replica count.

Acceptance criteria

• For any workload deployment, an operator can read ready, current, updated, and desired replica counts from the same place the conditions already come from
• The counts appear wherever the conditions already appear, with the same project and deployment labels

Related to datum-cloud/infra#3897