Fix link to Microsoft Playwright Workspaces

[rorywoods]

Playwright Testing is going EOL. If this service uses the new Playwright Workspaces in Azure App Testing then suggest updating the link accordingly.

[prmerger-automator]

@rorywoods : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

[learn-build-service-prod]

Learn Build status updates of commit b412e8a:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/ai-foundry/agents/how-to/tools/browser-automation.md	✅Succeeded

For more details, please refer to the build report.

[ShannonLeavitt]

@aahill

Can you review the proposed changes?

IMPORTANT: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team

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[v-dirichards]

@aahill Could you review this proposed update to your article and enter #sign-off in a comment if it's ready to merge?

Thanks!

[Copilot]

Pull Request Overview

Updates documentation link to point from deprecated Playwright Testing endpoint to the new Microsoft Playwright Workspaces location under Azure App Testing.

• Replace outdated /azure/playwright-testing link with /azure/app-testing/playwright-workspaces equivalent.
• Ensures readers are directed to the current service documentation.

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