Add note about importance of checking Application Gateway Activity Logs

[rishisingh0722]

Most users often overlook checking the Application Gateway Activity Logs. Adding this reminder helps users detect issues early by verifying AGIC configuration updates and operational events.
https://learn.microsoft.com/en-us/azure/application-gateway/ingress-controller-troubleshoot

[prmerger-automator]

@rishisingh0722 : 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 897a9f0:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/application-gateway/ingress-controller-troubleshoot.md	✅Succeeded

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[Copilot]

Pull Request Overview

This PR adds a troubleshooting reminder to check Application Gateway Activity Logs when debugging AGIC (Application Gateway Ingress Controller) issues. This helps users verify configuration updates and detect gateway-related problems that may not be visible from the Kubernetes side.

Key Changes:

• Added new section "Review Application Gateway Activity Log" with guidance on checking Activity Logs for AGIC configuration updates

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[v-dirichards]

@mbender-ms

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

[learn-build-service-prod]

Learn Build status updates of commit b2cb104:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/application-gateway/ingress-controller-troubleshoot.md	✅Succeeded

For more details, please refer to the build report.

[prmerger-automator]

Invalid command: '#sign-off'. Only the assigned author of one or more file in this PR can sign off. @mbender-ms

[prmerger-automator]

Invalid command: '#sign-off'. Only the assigned author of one or more file in this PR can sign off. @mbender-ms

[v-dirichards]

@mbender-ms - 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