Add Playwright Workspaces authenticated proxy samples

[dhruvaggarwal9]

Add authenticated proxy samples for Playwright Workspaces

Adds a self-contained sample project under samples/playwright-proxy-tests/ demonstrating how to route remote Chromium sessions in Playwright Workspaces through an authenticated HTTP proxy.

Included

• connectOverCdp.mjs — Playwright over CDP using chromium.connectOverCDP() and newContext({ proxy })
• rawCdp.mjs — raw CDP WebSocket example with explicit Fetch.authRequired handling
• playwrightConnect.mjs — Playwright native protocol using chromium.connect()
• Helper utilities, documentation, and setup instructions
• Deployable authenticated proxy server with Docker and Azure Container Instances deployment script

Scenarios Covered

• Playwright Workspaces authentication
• Authenticated HTTP proxy configuration
• Proxy authentication (407 Proxy Authentication Required)
• CDP vs Playwright native protocol connectivity
• Accessing private resources through a proxy

Testing

Validated all samples end-to-end against Playwright Workspaces and a deployed proxy:

• Direct and proxied requests use different egress IPs
• Proxied requests successfully route through the authenticated proxy
• Private origin access works through the proxy tunnel
• Raw CDP flow correctly handles proxy authentication challenges

Notes

• No credentials or tokens are committed (.env is gitignored)
• The sample is self-contained and runnable with minimal setup

[dhruvaggarwal9]

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