Fix flaky target allocator tests (#2615) #6550

Job	Run time
End-to-end tests e2e on K8s 1.23	7m 30s
End-to-end tests e2e-instrumentation on K8s 1.23	7m 48s
End-to-end tests e2e-upgrade on K8s 1.23	6m 50s
End-to-end tests e2e-autoscale on K8s 1.23	6m 29s
End-to-end tests e2e-pdb on K8s 1.23	6m 26s
End-to-end tests e2e-opampbridge on K8s 1.23	6m 27s
End-to-end tests e2e-targetallocator on K8s 1.23	7m 18s
End-to-end tests e2e-prometheuscr on K8s 1.23	6m 48s
End-to-end tests e2e-multi-instrumentation on K8s 1.23	7m 22s
End-to-end tests e2e on K8s 1.29	7m 33s
End-to-end tests e2e-instrumentation on K8s 1.29	7m 59s
End-to-end tests e2e-upgrade on K8s 1.29	7m 0s
End-to-end tests e2e-autoscale on K8s 1.29	6m 27s
End-to-end tests e2e-pdb on K8s 1.29	6m 15s
End-to-end tests e2e-opampbridge on K8s 1.29	6m 20s
End-to-end tests e2e-targetallocator on K8s 1.29	7m 42s
End-to-end tests e2e-prometheuscr on K8s 1.29	6m 37s
End-to-end tests e2e-multi-instrumentation on K8s 1.29	7m 17s
e2e-tests-check	1s
	2h 6m 9s

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