test(helm-rbac-tests): remove unused anyhow::Context import to satisfy -D warnings

Author: iOS E2E Implementation

crates/helm-rbac-tests/tests/tls_auth_policy.rs

@@ -1,4 +1,4 @@
-use anyhow::{Context, Result};
+use anyhow::Result;
 use std::fs;
 use std::path::PathBuf;