feat: Introduce labels in agent and gateways for usage in NetworkPolicy #2602

Job	Run time
setup	18s
e2e (logs)	12m 7s
e2e-istio	10m 9s
e2e-dev (logs)	6m 26s
e2e (metrics && set_a)	11m 38s
e2e-self-mon (logs, healthy)	7m 30s
e2e-dev (metrics)	6m 18s
e2e (metrics && set_b)	9m 36s
e2e-self-mon (logs, backpressure)	9m 28s
e2e-dev (traces)	6m 11s
e2e (traces)	10m 35s
e2e-self-mon (logs, outage)	11m 57s
e2e (telemetry)	8m 38s
e2e-self-mon (metrics, healthy)	7m 30s
e2e (max-pipeline)	6m 27s
e2e-self-mon (metrics, backpressure)	11m 57s
e2e (telemetry-log-analysis)	13m 35s
e2e-self-mon (metrics, outage)	12m 25s
e2e-self-mon (traces, healthy)	7m 30s
e2e-self-mon (traces, backpressure)	8m 56s
e2e-self-mon (traces, outage)	11m 58s
	3h 11m 9s

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