Link to Espresso docs broken

[charliealbright]

The external link to Espresso documentation is broken on this page.

Current link: https://developer.android.com/training/testing/ui-testing/espresso-testing.html

Screenshot of current broken link:

Suggested replacement: https://developer.android.com/training/testing/espresso

---

Document Details

⚠ Do not edit this section. It is required for docs.microsoft.com ➟ GitHub issue linking.

• ID: 02d8bdce-a2ad-80cb-efdb-74c0bb3ebb8c
• Version Independent ID: b8d0b4a7-a6b0-42d6-aab3-58a9d8681502
• Content: Preparing Espresso Tests for Upload - Visual Studio App Center
• Content Source: docs/test-cloud/frameworks/espresso/index.md
• Service: vs-appcenter
• Sub-service: app-center-test
• GitHub Login: @lucen-ms
• Microsoft Alias: lucen