fix(s3exporter/config-validation): endpoint should contain region and S3 bucket #34941

Job	Run time
collector-build	5m 42s
docker-build	5m 51s
supervisor-test	1m 15s
kubernetes-test-matrix (v1.26.0, receiver/k8sclusterreceiver)	4m 48s
kubernetes-test-matrix (v1.26.0, processor/k8sattributesprocessor)	5m 55s
kubernetes-test-matrix (v1.26.0, receiver/kubeletstatsreceiver)	4m 17s
kubernetes-test-matrix (v1.26.0, receiver/k8sobjectsreceiver)	3m 17s
kubernetes-test-matrix (v1.25.3, receiver/k8sclusterreceiver)	4m 46s
kubernetes-test-matrix (v1.25.3, processor/k8sattributesprocessor)	4m 33s
kubernetes-test-matrix (v1.25.3, receiver/kubeletstatsreceiver)	4m 19s
kubernetes-test-matrix (v1.25.3, receiver/k8sobjectsreceiver)	3m 32s
kubernetes-test-matrix (v1.24.7, receiver/k8sclusterreceiver)	5m 0s
kubernetes-test-matrix (v1.24.7, processor/k8sattributesprocessor)	4m 50s
kubernetes-test-matrix (v1.24.7, receiver/kubeletstatsreceiver)	4m 19s
kubernetes-test-matrix (v1.24.7, receiver/k8sobjectsreceiver)	3m 19s
kubernetes-test-matrix (v1.23.13, receiver/k8sclusterreceiver)	4m 51s
kubernetes-test-matrix (v1.23.13, processor/k8sattributesprocessor)	4m 36s
kubernetes-test-matrix (v1.23.13, receiver/kubeletstatsreceiver)	6m 0s
kubernetes-test-matrix (v1.23.13, receiver/k8sobjectsreceiver)	3m 22s
kubernetes-test	1s
	1h 24m 33s

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