Add tenant IDs where needed in Snuba API to breakdown genericmetrics COGS label further

[ayirr7]

We seem to have a genericmetrics app feature that shows up in the Clickhouse compute cost, which should be broken down further by use case so we can attribute COGS costs appropriately.

Last time I checked, this was largely due to the subscriptions executor not having a tenant ID associated with each query. One of the best solutions for this problem may be to build in support for subscriptions in the MQL language, which I believe is already in the roadmap. Once this is complete, this should be resolved.