Sanity tests perf improvements

[dmitrivMS]

Changes
Reduced time taken by Windows ARM64 job:

• Used custom Node.js install step to ensure matching architecture
• Removed/reduced powershell calls
• Use curl for downloads

Note
Addressed some PR feedback from previous changes.
Removed 64k page test.

Validation
With these changes all sanity tests run in ~10 minutes.

[vs-code-engineering]

📬 CODENOTIFY

The following users are being notified based on files changed in this PR:

@lszomoru

Matched files:

• build/azure-pipelines/common/sanity-tests.yml
• build/azure-pipelines/product-sanity-tests.yml

[Copilot]

Pull request overview

This PR implements performance improvements for sanity tests, particularly for the Windows ARM64 job. The changes focus on reducing PowerShell invocations, using native tools for better performance, and improving the Node.js installation process for ARM64 Windows builds.

Changes:

• Replaced Node.js fetch-based downloads with curl for better performance and built-in retry logic
• Batched Authenticode signature validations into single PowerShell calls instead of per-file invocations
• Added custom Node.js installation for Windows ARM64 to ensure correct architecture matching
• Improved WSL detection to verify actual usability, not just file existence
• Fixed GitHub OAuth flow to explicitly handle popup pages
• Used native fs.realpathSync for Windows path expansion instead of PowerShell

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
test/sanity/src/githubAuth.ts	Fixed regex to use global flag for removing hyphens; updated authorize flow to receive popup page directly instead of waiting for it internally; improved JSDoc comments
test/sanity/src/detectors.ts	Enhanced WSL detection by verifying the command actually works and has distributions installed, not just checking if wsl.exe exists
test/sanity/src/context.ts	Replaced PowerShell call with native fs.realpathSync for path expansion; replaced fetch/stream download with curl for better performance; batched Authenticode signature validation into single PowerShell call
test/sanity/src/cli.test.ts	Updated to track browser instance separately; properly await popup before passing to authorize flow; improved error handling for missing browser
build/azure-pipelines/product-sanity-tests.yml	Added arch parameter for Windows ARM64 job configuration
build/azure-pipelines/common/sanity-tests.yml	Added custom Node.js installation script for Windows ARM64 using curl and tar, falling back to standard NodeTool task for other platforms