Pass pod names as env var in deployments for logging purposes

[aliok]

Problem
With knative/pkg#1714, pod names passed as env vars are used in logging.

Persona:
Which persona is this feature for?

Exit Criteria
Pod name passed as env vars properly to pods in deployments.

Time Estimate (optional):
0.125

Additional context (optional)
Ref impl: knative/eventing#4072

[github-actions]

This issue is stale because it has been open for 90 days with no
activity. It will automatically close after 30 more days of
inactivity. Reopen the issue with /reopen. Mark the issue as
fresh by adding the comment /remove-lifecycle stale.

[lberk]

/remove-lifecycle stale

[tom24d]

/assign