fix: cases where opamp agent send disconnect message as a first messa… #3908

Job	Run time
build-and-test-instrumentor	5m 18s
build-and-test-odiglet	14m 34s
build-and-test-odigos-collector	9m 1s
build-autoscaler	2m 56s
build-cli	5m 59s
build-frontend	4m 5s
build-scheduler	2m 33s
test-common	23s
test-k8sutils	1m 0s
test-procdiscovery	23s
	46m 12s

Provide feedback