test(procmgr): use domain-qualified runtime user on Windows e2e

Build the expected Runtime User from USERDOMAIN and USERNAME so e2e
assertions match AccountName::display() output from runtime_user_for_pid.

Author: jose-manuel-almaza

pkg/procmgr/rust/tests/e2e.rs

@@ -29,7 +29,13 @@ fn current_runtime_user() -> String {
 
 #[cfg(windows)]
 fn current_runtime_user() -> String {
-    std::env::var("USERNAME").unwrap_or_else(|_| "unknown".to_string())
+    let user = std::env::var("USERNAME").unwrap_or_else(|_| "unknown".to_string());
+    let domain = std::env::var("USERDOMAIN").unwrap_or_default();
+    if domain.is_empty() {
+        format!(r".\{user}")
+    } else {
+        format!(r"{domain}\{user}")
+    }
 }
 
 #[test]