[cmd/opampsupervisor]: Allow configuring agent description #33335

Job	Run time
collector-build	7m 51s
docker-build	7m 58s
supervisor-test	1m 1s
kubernetes-test-matrix (v1.26.0, receiver/k8sclusterreceiver)	5m 0s
kubernetes-test-matrix (v1.26.0, processor/k8sattributesprocessor)	4m 32s
kubernetes-test-matrix (v1.26.0, receiver/kubeletstatsreceiver)	4m 35s
kubernetes-test-matrix (v1.26.0, receiver/k8sobjectsreceiver)	3m 24s
kubernetes-test-matrix (v1.25.3, receiver/k8sclusterreceiver)	4m 54s
kubernetes-test-matrix (v1.25.3, processor/k8sattributesprocessor)	4m 31s
kubernetes-test-matrix (v1.25.3, receiver/kubeletstatsreceiver)	4m 35s
kubernetes-test-matrix (v1.25.3, receiver/k8sobjectsreceiver)	3m 25s
kubernetes-test-matrix (v1.24.7, receiver/k8sclusterreceiver)	4m 59s
kubernetes-test-matrix (v1.24.7, processor/k8sattributesprocessor)	4m 35s
kubernetes-test-matrix (v1.24.7, receiver/kubeletstatsreceiver)	5m 55s
kubernetes-test-matrix (v1.24.7, receiver/k8sobjectsreceiver)	3m 46s
kubernetes-test-matrix (v1.23.13, receiver/k8sclusterreceiver)	4m 57s
kubernetes-test-matrix (v1.23.13, processor/k8sattributesprocessor)	4m 40s
kubernetes-test-matrix (v1.23.13, receiver/kubeletstatsreceiver)	4m 25s
kubernetes-test-matrix (v1.23.13, receiver/k8sobjectsreceiver)	3m 20s
kubernetes-test	1s
	1h 28m 24s

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