Improve telemetry testing flag semantics

[gregglind]

it's annoying to 'remove testing flag'. Not sure how we should best solve this.

[motin]

What is the purpose of the testing flag? Can we drop it? For automated tests, we can set the telemetry server endpoint to an invalid endpoint (done by default in geckodriver) so that automated test telemetry only lands in telemetry archive without being actually sent

[gregglind]

This flag serves to mark garbage pings as garbage during the ping development process.

There is a lot to revise about ping development and analysis that impacts how we rip this out.

I agree it's currently not a great process.

[motin]

A suggestion for change in the utils for improving telemetry testing flag semantics is to change removeTestingFlag: false in the study setup to testing: true so that it is clearer when the telemetry pings are being marked for testing.