Track release info of GDK version in telemetry

What does this merge request do and why?

Track release info of GDK version in telemetry

This adds a release property to the telemetry payload, which contains the date of the HEAD commit in GDK and the short SHA of said commit. This allows us to track the version adoption. It also helps us discover if there is a telemetry anomaly (e.g. due to a bug causing an excessive number of events being sent) or if a certain version broke a certain feature.

Closes #2986 (closed)

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

Impacted categories

The following categories relate to this merge request:

• gdk-reliability - e.g. When a GDK action fails to complete.
• gdk-usability - e.g. Improvements or suggestions around how the GDK functions.
• gdk-performance - e.g. When a GDK action is slow or times out.

Merge request checklist

• This MR references an issue describing the change.
• This change is backward compatible. If not, please include steps to communicate to our users.
• Tests added for new functionality. If not, please raise an issue to follow-up.
• Documentation added/updated, if needed.
• Announcement added, if change is notable.
• gdk doctor test added, if needed.