chore(slack): temporarily track snuba user count queries round 2

[cathteng]

Try with group_id as a tag instead of group, group appears to be some kind of reserved word.

[sentry]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ RateLimitExceeded: Query on could not be run due to allocation policies, info: {'details': {'BytesScannedRejectingPo... sentry.tasks.activity.send_activity_notifications View Issue

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