fix(procmgr): clear secret caches on config reload

Invalidate secret-backend and Windows SCM env caches before reloading
processes.d so config gates re-evaluate with fresh values.

Author: jose-manuel-almaza

pkg/procmgr/rust/src/manager/reload.rs

@@ -138,6 +138,7 @@ impl ProcessManager {
         &self,
         handles: &RuntimeHandles,
     ) -> Result<ReloadResult, Status> {
+        crate::config_gate::clear_secret_caches();
         let new_configs = self.config_loader.load();
 
         let removed = self