Reduce diagnostic logging in Desktop and Mobile Test Case Coverage Reports

[AaronMT]

https://github.com/mozilla-mobile/testops-dashboard/actions/runs/27148942984/job/80134489426
https://github.com/mozilla-mobile/testops-dashboard/actions/runs/27148942984/job/80134489442

Diagnostic logging should be opt-in at the time of workflow run.

[AaronMT]

I removed the print in a235ce4 @isabelrios as a head's up.

I want to do a pass on improving when we turn on logging.