Add flag to `Analytics` instance that disables analytics for that specific run

[eliasyishak]

fyi @bwilkerson

[bwilkerson]

Sorry for the miscommunication, but I don't need a flag on the Analytics instance. I need to add a command-line flag to the analysis server that will cause it to not create an Analytics instance. By not creating an instance at all we guard against any bugs that might cause an event to be sent.