fix(ci): pass credentials_driver arg to ServerState::new in tests

The credentials_driver parameter was added to ServerState::new but
test helpers in policy.rs and provider.rs were not updated.

Assisted-By: Claude (Anthropic AI) <noreply@anthropic.com>
Signed-off-by: Paolo Dettori <dettori@us.ibm.com>

Author: pdettori

crates/openshell-server/src/grpc/policy.rs

@@ -3511,6 +3511,7 @@ mod tests {
             TracingLogBus::new(),
             Arc::new(SupervisorSessionRegistry::new()),
             None,
+            None,
         ))
     }
 

crates/openshell-server/src/grpc/provider.rs

@@ -809,6 +809,7 @@ mod tests {
             TracingLogBus::new(),
             Arc::new(SupervisorSessionRegistry::new()),
             None,
+            None,
         ))
     }