chore: Refactor unit-tests to use golden files #2984

Job	Run time
setup	19s
e2e-dev (logs)	6m 11s
e2e (logs)	10m 51s
e2e-istio	10m 40s
e2e-dev (metrics)	5m 43s
e2e-self-mon (logs, healthy)	7m 32s
e2e-dev (traces)	5m 46s
e2e (metrics && set_a)	12m 0s
e2e-self-mon (logs, backpressure)	9m 29s
e2e (metrics && set_b)	9m 6s
e2e-self-mon (logs, outage)	10m 31s
e2e (traces)	9m 59s
e2e-self-mon (metrics, healthy)	6m 59s
e2e (telemetry)	8m 6s
e2e-self-mon (metrics, backpressure)	10m 58s
e2e (max-pipeline)	6m 21s
e2e-self-mon (metrics, outage)	11m 58s
e2e-self-mon (traces, healthy)	7m 28s
e2e (telemetry-log-analysis)	11m 59s
e2e-self-mon (traces, backpressure)	8m 29s
e2e-self-mon (traces, outage)	11m 57s
	3h 2m 22s

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