fix(sandbox): use is_ok_and instead of map+unwrap_or for clippy

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: linkSt

rust/crates/runtime/src/sandbox.rs

@@ -299,8 +299,7 @@ fn unshare_user_namespace_works() -> bool {
             .stdout(std::process::Stdio::null())
             .stderr(std::process::Stdio::null())
             .status()
-            .map(|s| s.success())
-            .unwrap_or(false)
+            .is_ok_and(|s| s.success())
     })
 }