[ACS][CallAutomation]Add new metric for call automation callback event

[fangchen0601]

[prmerger-automator[bot]]

@fangchen0601 : Thanks for your contribution! The author(s) have been notified to review your proposed change.

[learn-build-service-prod[bot]]

Learn Build status updates of commit 8b4df63:

:warning: Validation status: warnings

File	Status	Preview URL	Details
articles/communication-services/concepts/analytics/logs/call-automation-metrics.md	:warning:Warning		Details

articles/communication-services/concepts/analytics/logs/call-automation-metrics.md

• Line 103, Column 317: [Warning: hard-coded-locale - See documentation] Link 'https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/troubleshooting-codes?pivots=callend' contains locale code 'en-us'. For localizability, remove 'en-us' from links to most Microsoft sites.
• Line 103, Column 317: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/troubleshooting-codes?pivots=callend' will be broken in isolated environments. Replace with a relative link.

For more details, please refer to the build report.

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[learn-build-service-prod[bot]]

Learn Build status updates of commit 4c321ba:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
articles/communication-services/concepts/analytics/logs/call-automation-metrics.md	:white_check_mark:Succeeded

For more details, please refer to the build report.

For any questions, please:

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[prmerger-automator[bot]]

PRMerger Results

Issue	Description
File Change Percent	This PR contains file(s) with more than 30% file change.

[ShannonLeavitt]

@fangchen0601 - You have opened this PR in the public repo. Please point your changes to the private repo (azure-docs-pr) instead, as you have done here.