Cleanup environments

[pnadolny13]

Environments werent flowing through for structured events. In the process of fixing it I moved them out into a dimension table so we're consistently referencing them across the board.

Additionally there was a bug with snowplow staging for CI because no records were flowing. I fixed that along with using sampling so we get a random set of snowplow events vs just the recent schemas. Hopefully this allows us to catch bugs related to the different event schema versions over time vs just the recent schema.