azure-monitor-agent-windows-client.md - Added role assignment validation, support securestring token

[antnorwe]

• Added validation for role assignment to prevent errors if the signed in user already has owner permissions at the root scope
• Added support for the latest behaviour of Get-AzAccessToken, which now returns the token as a securestring

[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 04e26ab:

✅ 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.

[ttorble]

@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

[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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[v-dirichards]

@bwren

Can you review this old PR and determine whether it needs to be closed or merged?

@MicrosoftDocs/public-repo-pr-review-team

[bwren]

#sign-off

[prmerger-automator]

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