Microgravity should fire front-end events in the force-production segment project

[anipetrov]

Microgravity is still sending events in the microgravity-production segment project. It should all events to force-production instead and there should be a single segment write key in force.

Note that the Analytics team needs to do some work on pageview and session transformations to be ready to take mG events in force. We should coordinate the turning of the switch.

cc @craigspaeth