Missing CRD install step in 03-auto instrumentation#5

Hello, Maybe my system was weird, but I struggled to get the operator going: ```console ~/ghorg/pavolloffay/kubecon-eu-2024-opentelemetry-kubernetes-tracing-tutorial main ❯ kubectl apply -f backend/03-collector.yaml error: resource mapping not found for name: "otel" namespace: "observability-backend" from "backend/03-collector.yaml": no matches for kind "OpenTelemetryCollector" in version "opentelemetry.io/v1alpha1" ensure CRDs are installed first ~/ghorg/pavolloffay/kubecon-eu-2024-opentelemetry-kubernetes-tracing-tutorial main ❯ kubectl apply -f https://raw.githubusercontent.com/open-telemetry/opentelemetry-operator/3a3df0b2885d6d3c4c99886ac16b0fb127452e8f/config/crd/bases/opentelemetry.io_opentelemetrycollectors.yaml customresourcedefinition.apiextensions.k8s.io/opentelemetrycollectors.opentelemetry.io created ~/ghorg/pavolloffay/kubecon-eu-2024-opentelemetry-kubernetes-tracing-tutorial main ❯ kubectl apply -f backend/03-collector.yaml opentelemetrycollector.opentelemetry.io/otel created ```