Added a "LatestEvents" field to the FetchedInstanceHistory log

[sophiatev]

As per the title, this PR introduces a new log field to log the last 10 events from a fetch instance history call to improve our telemetry.

[Copilot]

Pull request overview

This PR extends the Azure Storage tracking telemetry for “FetchedInstanceHistory” by adding a new structured log/ETW field (LatestEvents) that records the last 10 history event types returned by a fetch instance history query.

Changes:

• Add LatestEvents to the FetchedInstanceHistory structured log event and propagate it through LogHelper and AnalyticsEventSource.
• Populate LatestEvents from the last 10 event types when reading history entities in AzureTableTrackingStore.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
src/DurableTask.AzureStorage/Tracking/AzureTableTrackingStore.cs	Adds computation of the last 10 history event types and passes them into the logger.
src/DurableTask.AzureStorage/Logging/LogHelper.cs	Extends FetchedInstanceHistory helper to accept and forward the LatestEvents field.
src/DurableTask.AzureStorage/Logging/LogEvents.cs	Adds a new structured field/property (LatestEvents) to the FetchedInstanceHistory log event.
src/DurableTask.AzureStorage/AnalyticsEventSource.cs	Extends the ETW FetchedInstanceHistory event payload to include LatestEvents.

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[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.