fix(server): reflect terminalId default in workspace script schema test

workspace script schema defaults terminalId to null; include it in the
expected shape of the test's toEqual assertion.

packages/server/src/shared/messages.workspaces.test.ts

@@ -163,6 +163,7 @@ describe("workspace message schemas", () => {
         lifecycle: "running",
         health: "healthy",
         exitCode: null,
+        terminalId: null,
       },
     ]);
   });