Revert JetBrains test mock: use real network calls now that cloudfront.net is whitelisted

Agent-Logs-Url: https://github.com/nbauma109/setup-java/sessions/74ae64af-1192-420c-8c3e-aefa09bfb00a

Co-authored-by: nbauma109 <9403560+nbauma109@users.noreply.github.com>

Author: Copilot

__tests__/distributors/jetbrains-installer.test.ts

@@ -3,10 +3,10 @@ import {HttpClient} from '@actions/http-client';
 import {JetBrainsDistribution} from '../../src/distributions/jetbrains/installer';
 
 import manifestData from '../data/jetbrains.json';
+import os from 'os';
 
 describe('getAvailableVersions', () => {
   let spyHttpClient: jest.SpyInstance;
-  let spyHttpClientHead: jest.SpyInstance;
 
   beforeEach(() => {
     spyHttpClient = jest.spyOn(HttpClient.prototype, 'getJson');
@@ -15,10 +15,6 @@ describe('getAvailableVersions', () => {
       headers: {},
       result: []
     });
-    spyHttpClientHead = jest.spyOn(HttpClient.prototype, 'head');
-    spyHttpClientHead.mockReturnValue({
-      message: {statusCode: 200}
-    });
   });
 
   afterEach(() => {
@@ -44,8 +40,9 @@ describe('getAvailableVersions', () => {
     const availableVersions = await distribution['getAvailableVersions']();
     expect(availableVersions).not.toBeNull();
 
-    // manifestData items + 2 hidden versions (always included when head is mocked to return 200)
-    expect(availableVersions.length).toBe(manifestData.length + 2);
+    const length =
+      os.platform() === 'win32' ? manifestData.length : manifestData.length + 2;
+    expect(availableVersions.length).toBe(length);
   }, 10_000);
 });