Add crash rate for beta and client count for stable/beta to Flutter Tool Analytics dashboard

[andrewkolos]

When Google Analytics (GA) 3 went offline (back in May or so?), the analytics dashboard for the flutter tool was effectively lost, and the queries used could not be directly ported to GA4.

One frequent use case of the dashboard was to track adoption of new releases and keep and eye on the quality of those branches (how often are users with telemetry enabled are reporting crashes on any given day, the "crash rate"). The tools team monitors the crash rate weekly to make sure the tool meets our quality bar, and having this information helps us prioritize quality of existing features when necessary.

Today, the Flutter Tool Analytics dashboard only has the crash rate for most recent stable branches, which I added some weeks ago. It should also have this information for the beta channel branches. The dashboard doesn't have user counts for stable nor beta.

[andrewkolos]

The beta channel crash rate is now available on the dashboard.

[andrewkolos]

Added users counts for stable and beta. Closing as completed.

[github-actions]

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