fix: Anify timeout logic running even when fetch resolved

Summary:

Test Plan:

src/libs/promiseTimeout.ts

@@ -0,0 +1,27 @@
+export function promiseTimeout<T>(
+  promise: Promise<T>,
+  timeoutMs: number,
+): Promise<T | null> {
+  let hasPromiseResolved = false;
+
+  return Promise.race([
+    promise.then((value) => {
+      hasPromiseResolved = true;
+      return value;
+    }),
+    new Promise((resolve) => setTimeout(resolve, timeoutMs)).then(() => {
+      if (hasPromiseResolved) {
+        return null;
+      }
+
+      throw new PromiseTimedOutError();
+    }),
+  ]);
+}
+
+export class PromiseTimedOutError extends Error {
+  constructor(message?: string) {
+    super(message ?? "Promise timed out");
+    this.name = "PromiseTimedOutError";
+  }
+}