chore: Revert running branch integration only on merge group #3060

Job	Run time
setup	14s
e2e (logs)	10m 18s
e2e (metrics && set_a)	11m 14s
e2e-self-mon (logs, healthy)	5m 14s
e2e-istio	8m 48s
e2e (metrics && set_b)	7m 55s
e2e-experimental (logs)	4m 36s
e2e-self-mon (logs, backpressure)	7m 15s
e2e (traces)	6m 59s
e2e-experimental (metrics)	4m 2s
e2e-self-mon (logs, outage)	8m 42s
e2e-self-mon (metrics, healthy)	5m 46s
e2e-experimental (traces)	4m 34s
e2e (telemetry)	5m 41s
e2e-self-mon (metrics, backpressure)	9m 42s
e2e (max-pipeline)	4m 15s
e2e-self-mon (metrics, outage)	10m 16s
e2e (telemetry-log-analysis)	11m 36s
e2e-self-mon (traces, healthy)	5m 44s
e2e-self-mon (traces, backpressure)	7m 14s
e2e-self-mon (traces, outage)	10m 43s
	2h 30m 48s

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