feat: Introduce labels in agent and gateways for usage in NetworkPolicy #2637

Job	Run time
setup	20s
e2e-istio	10m 1s
e2e (logs)	10m 33s
e2e-dev (logs)	5m 46s
e2e (metrics && set_a)	11m 13s
e2e-self-mon (logs, healthy)	7m 27s
e2e-dev (metrics)	5m 45s
e2e (metrics && set_b)	8m 38s
e2e-self-mon (logs, backpressure)	10m 53s
e2e-dev (traces)	5m 33s
e2e (traces)	8m 34s
e2e-self-mon (logs, outage)	10m 20s
e2e (telemetry)	8m 25s
e2e-self-mon (metrics, healthy)	6m 55s
e2e (max-pipeline)	6m 3s
e2e-self-mon (metrics, backpressure)	11m 21s
e2e (telemetry-log-analysis)	13m 0s
e2e-self-mon (metrics, outage)	11m 52s
e2e-self-mon (traces, healthy)	6m 51s
e2e-self-mon (traces, backpressure)	8m 21s
e2e-self-mon (traces, outage)	11m 51s
	2h 59m 42s

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