test: migrate integration tests and vscode extension tests (Part 3)

[joehan]

Description

This is Part 3 of the native fetch migration. It contains the integration and VS Code extension tests.

• Added requireAuthWrapper(false) in the VS Code extension test runner (firebase-vscode/src/test/runTest.ts) to initialize the CLI auth state and prevent unhandled token refresh rejections.
• Migrated the VS Code error handling integration tests to use the custom mock helper and set the token in the env.
• Migrated integration test scripts (scripts/hosting-tests/, etc.).

This PR is stacked on top of:

• Part 2 (Unit Tests): test: migrate unit tests and add custom nock compatibility helper (Part 2) #10724

[gemini-code-assist]

Code Review

This pull request cleans up unused node-fetch imports, adds a --debug flag to local hosting tests, and updates VS Code integration tests to use a temporary user data directory and mock authentication via nock. Feedback on these changes highlights a cross-platform compatibility issue with hardcoding /tmp on Windows, and recommends properly saving and restoring process.env.FIREBASE_TOKEN in tests to prevent test pollution.

[gemini-code-assist]

Hardcoding "/tmp" as the temporary directory path will fail on Windows platforms, as /tmp is not a standard directory there. Use os.tmpdir() to resolve the temporary directory in a cross-platform manner.

Suggested change

	const tmpUserData = path.join("/tmp", `vsc-ud-${Math.random().toString(36).substring(2, 7)}`);
	const tmpUserData = path.join(require("os").tmpdir(), `vsc-ud-${Math.random().toString(36).substring(2, 7)}`);

[gemini-code-assist]

Modifying process.env.FIREBASE_TOKEN directly without restoring its original value can cause side effects or failures in other tests running in the same process (especially in CI environments where a real token might be set). Consider saving the original value and restoring it in teardown.

      (globalThis as any).originalFirebaseToken = process.env.FIREBASE_TOKEN;
      process.env.FIREBASE_TOKEN = "mock_refresh_token";

[gemini-code-assist]

Restore the original FIREBASE_TOKEN instead of unconditionally deleting it, to avoid breaking other tests that might run in the same process.

      if ((globalThis as any).originalFirebaseToken === undefined) {
        delete process.env.FIREBASE_TOKEN;
      } else {
        process.env.FIREBASE_TOKEN = (globalThis as any).originalFirebaseToken;
      }