fix(procmgr): refresh Agent SCM env cache on config reload

Reread datadogagent service Environment registry before gate
reconciliation so DD_* overrides stay in sync when the Agent
restarts without restarting dd-procmgr.

Author: jose-manuel-almaza

pkg/procmgr/rust/src/manager.rs

@@ -325,6 +325,7 @@ impl ProcessManager {
         crate::config_gate::clear_secret_caches();
         #[cfg(windows)]
         platform::refresh_core_agent_scm_environment();
+
         let new_configs = self.config_loader.load();
 
         let removed = self