Remove top level await

And add promise rejection handler to satisfy eslint.

packages/dito/app/entry.server.tsx

@@ -16,14 +16,19 @@ import logResponseStatus from "utils/logging";
 import { NonceProvider } from "utils/nonce";
 
 if (process.env.MOCK_EXTERNAL_APIS && process.env.NODE_ENV !== "production") {
-  await import("mocks/node").then(({ mockServer }) => {
-    console.warn("Mock external APIs.");
-    mockServer.listen({
-      // This is going to perform unhandled requests
-      // but print no warning whatsoever when they happen.
-      onUnhandledRequest: "bypass",
-    });
-  });
+  import("mocks/node").then(
+    ({ mockServer }) => {
+      console.warn("Mock external APIs.");
+      mockServer.listen({
+        // This is going to perform unhandled requests
+        // but print no warning whatsoever when they happen.
+        onUnhandledRequest: "bypass",
+      });
+    },
+    () => {
+      console.error("Failed to mock external APIs.");
+    },
+  );
 }
 
 const ABORT_DELAY = 5_000;