PrometheusAgent.spec.remoteWrite[].tlsConfig.cert.secret.spec.arbitraryFSAccessThroughSMs

When true, ServiceMonitor, PodMonitor and Probe object are forbidden to reference arbitrary files on the file system of the 'prometheus' container. When a ServiceMonitor's endpoint specifies a `bearerTokenFile` value (e.g. '/var/run/secrets/kubernetes.io/serviceaccount/token'), a malicious target can get access to the Prometheus service account's token in the Prometheus' scrape request. Setting `spec.arbitraryFSAccessThroughSM` to 'true' would prevent the attack. Users should instead provide the credentials using the `spec.bearerTokenSecret` field.