azure-monitor-agent-windows-client.md - Update authentication header in disassociate DCR script

[antnorwe]

• Added support for the latest behaviour of Get-AzAccessToken, which now returns the token as a securestring, to the Disassociate script as well

Follow on from #182

[prmerger-automator]

@antnorwe : 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 fa3aca9:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/azure-monitor/agents/azure-monitor-agent-windows-client.md	✅Succeeded

For more details, please refer to the build report.

[Court72]

@bwren

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]

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

Thanks!

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[Copilot]

Pull Request Overview

Updates the authentication header configuration in the disassociate DCR script to handle the latest behavior of Get-AzAccessToken, which now returns tokens as secure strings instead of plain text.

• Updated the authorization header construction to convert secure string tokens to plain text
• Ensures compatibility with newer versions of the Azure PowerShell module

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