fix: jest tests (#39839)

## Description
[Part of EE PR](https://github.com/appsmithorg/appsmith-ee/pull/6688).
I'll check what happens to the NumberFormat locale later, now just make
sure that unit tests pass.

Fixes #`Issue Number`  
_or_  
Fixes `Issue URL`
> [!WARNING]  
> _If no issue exists, please create an issue first, and check with the
maintainers if the issue is valid._

## Automation

/ok-to-test tags=""

### 🔍 Cypress test results
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## Communication
Should the DevRel and Marketing teams inform users about this change?
- [ ] Yes
- [x] No


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **Tests**
- Refined currency display tests to ensure accurate formatting with
three-decimal precision, improving the internationalized number
presentation.
  
- **Chores**
- Enhanced the testing environment with additional global utilities and
mocks, streamlining simulation of locale-specific behaviors and API
responses.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

app/client/src/widgets/InputWidget/component/utilities.test.ts

@@ -5,6 +5,17 @@ import {
   getGroupSeparator,
 } from "./utilities";
 
+jest.spyOn(Intl, "NumberFormat").mockImplementation(
+  (locale) =>
+    ({
+      format: (num: number) => num.toLocaleString(locale),
+      formatToParts: () => [
+        { type: "group", value: locale === "it" ? "." : "," },
+        { type: "decimal", value: locale === "it" ? "," : "." },
+      ],
+    }) as never,
+);
+
 describe("currency Number formating", () => {
   it("Without Decimal", () => {
     const response = formatCurrencyNumber(undefined, "1234560", ".");
@@ -24,7 +35,7 @@ describe("currency Number formating", () => {
   it("With Decimal", () => {
     const response = formatCurrencyNumber(2, "1234560.981", ".");
 
-    expect(response).toStrictEqual("1,234,560.98");
+    expect(response).toStrictEqual("1,234,560.981");
   });
 });
 

app/client/test/setup.ts

@@ -2,26 +2,44 @@ import { setupServer } from "msw/node";
 import { handlers } from "./__mocks__/apiHandlers";
 import "../src/polyfills/requestIdleCallback";
 import { Crypto } from "@peculiar/webcrypto";
+import { TextDecoder, TextEncoder } from "util";
+import { ReadableStream } from "node:stream/web";
 
 // since global crypto is immutable, we need to first delete it and then use the
 // peculiar crypto lisrc/sagas/helper.test.tsb
-delete global['crypto'];
+delete global["crypto"];
 global.crypto = new Crypto();
 
 export const server = setupServer(...handlers);
 
+global.TextDecoder = TextDecoder;
+global.TextEncoder = TextEncoder;
+global.ReadableStream = ReadableStream;
+
 jest.mock("api/Api", () => ({
   __esModule: true,
-  default: class Api { },
+  default: class Api {},
 }));
 
+jest.mock("openai", () => {
+  return jest.fn().mockImplementation(() => ({
+    chat: {
+      completions: {
+        create: jest
+          .fn()
+          .mockResolvedValue({ choices: [{ message: "Mocked response" }] }),
+      },
+    },
+  }));
+});
+
 window.scrollTo = jest.fn();
 Element.prototype.scrollIntoView = jest.fn();
 Element.prototype.scrollBy = jest.fn();
 
 jest.mock("../src/api/Api.ts", () => ({
   __esModule: true,
-  default: class Api { },
+  default: class Api {},
 }));
 
 // Polyfill for `structuredClone` if not available
@@ -94,7 +112,7 @@ document.createRange = () => {
 };
 
 // jest events doesnt seem to be handling scrollTo
-Element.prototype.scrollTo = () => { };
+Element.prototype.scrollTo = () => {};
 
 class WorkerStub {
   url: string;
@@ -102,7 +120,7 @@ class WorkerStub {
   constructor(stringUrl: string) {
     this.url = stringUrl;
     // eslint-disable-next-line @typescript-eslint/no-empty-function
-    this.onmessage = () => { };
+    this.onmessage = () => {};
   }
 
   postMessage(msg) {