Include the crash rate from mission control

[mostlygeek]

The crash stats ADI is gone in #280. It would still be nice to know if we are receiving crash stat data for the specific version. Mission Control displays this information. We could reuse some of the API calls to show a crash rate for a specific version on delivery-dashboard.

[magopian]

A few questions:

• does it make sense to duplicate the data if it's already displayed (very nicely!) in mission control?
• which data point would we be interested in? The score? The content_crashes and also the main_crashes?
• is there an API where we could query this data? I guess there's some information in https://docs.telemetry.mozilla.org/datasets/streaming/error_aggregates/reference.html

[mostlygeek]

I pinged relman about this to see if this would be useful to have on the dashboard. If not, then best not to invest effort here.

[peterbe]

@mostlygeek Any news on that ping?