fix: Anify timeout logic running even when fetch resolved

Summary:

Test Plan:

src/libs/promiseTimeout.spec.ts

@@ -0,0 +1,29 @@
+import { describe, expect, it } from "bun:test";
+
+import { PromiseTimedOutError, promiseTimeout } from "./promiseTimeout";
+
+describe("promiseTimeout", () => {
+  it("promise resolves within timeout, returns value", () => {
+    expect(
+      promiseTimeout(
+        wait(1).then(() => 2),
+        2,
+      ),
+    ).resolves.toBe(2);
+  });
+
+  it("promise does not resolve within timeout, throws PromiseTimedOutError", () => {
+    expect(
+      promiseTimeout(
+        wait(2).then(() => 2),
+        1,
+      ),
+    ).rejects.toThrow(PromiseTimedOutError);
+  });
+});
+
+function wait(ms: number) {
+  return new Promise((resolve) => {
+    setTimeout(resolve, ms);
+  });
+}