Add detailed tests for storage `read_range` spans.

[coryan]

we might be missing a test here

            "gcp.client.service" = INSTRUMENTATION.service_name,
            "gcp.client.version" = INSTRUMENTATION.client_version,
            "gcp.client.repo" = GCP_CLIENT_REPO_GOOGLEAPIS,
            "gcp.client.artifact" = INSTRUMENTATION.client_artifact,

Originally posted by @westarle in #5215