Fix flaky unit test (#2593) #6498

Job	Run time
End-to-end tests e2e on K8s 1.23	9m 9s
End-to-end tests e2e-instrumentation on K8s 1.23	4m 31s
End-to-end tests e2e-upgrade on K8s 1.23	7m 29s
End-to-end tests e2e-autoscale on K8s 1.23	8m 41s
End-to-end tests e2e-pdb on K8s 1.23	7m 20s
End-to-end tests e2e-opampbridge on K8s 1.23	7m 18s
End-to-end tests e2e-prometheuscr on K8s 1.23	7m 32s
End-to-end tests e2e-multi-instrumentation on K8s 1.23	8m 15s
End-to-end tests e2e on K8s 1.29	8m 4s
End-to-end tests e2e-instrumentation on K8s 1.29	8m 28s
End-to-end tests e2e-upgrade on K8s 1.29	7m 36s
End-to-end tests e2e-autoscale on K8s 1.29	7m 4s
End-to-end tests e2e-pdb on K8s 1.29	7m 11s
End-to-end tests e2e-opampbridge on K8s 1.29	7m 4s
End-to-end tests e2e-prometheuscr on K8s 1.29	7m 11s
End-to-end tests e2e-multi-instrumentation on K8s 1.29	8m 9s
e2e-tests-check	1s
	2h 1m 3s

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