Add service labels to kubernetes deployment

This issue has been spawned from gitlab-com/runbooks!7474 (comment 1950470174).

From @reprazent:

I see the groundwork has been done in the chart in #1 (closed), but I don't think that we've added the correct type, tier, ... labels to the resources when we implemented the chart. So to have all saturation points apply, we'll need to add those kubernetes labels.

We need to add the labels type, tier, stage, and shard to the deployment labels.