[Outlook] (OnMessageFromChanged, OnSensitivityLabelChanged) Update support in the unified manifest

[samantharamon]

The OnMessageFromChanged and OnSensitivityLabelChanged events are now supported in the unified manifest for Outlook on the web and the new Outlook on Windows.

[learn-build-service-prod]

Learn Build status updates of commit 6aa4773:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/develop/event-based-activation.md	✅Succeeded	View
docs/includes/outlook-sensitivity-label-event-support.md	✅Succeeded	n/a (file deleted or renamed)
docs/outlook/onmessagefromchanged-onappointmentfromchanged-events.md	✅Succeeded	View
docs/outlook/sensitivity-label.md	✅Succeeded	View

For more details, please refer to the build report.

[learn-build-service-prod]

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