feat: start collecting enhanced_persons metrics in usage reports

[raquelmsmith]

Problem

To add enhanced_persons addon to billing, need to start collecting some value in usage_reports with the usage_key.

Changes

Adds the metric to the usage_reports. The metric is currently the same exact as base events, because they are the exact same for now. When we have the column to query against to determine which events are actually enhanced_persons we will update the query here.

👉 Stay up-to-date with PostHog coding conventions for a smoother review.

Does this work well for both Cloud and self-hosted?

Yes.

How did you test this code?

Updated test. Query snapshots should update automatically.

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: posthog/tasks/usage_report.py

Function	Unhandled Issue
get_teams_with_billable_event_count_in_period	CHQueryErrorTooManySimultaneousQueries: Code: 202. posthog.tasks.tasks.update_quota_limiti... Event Count: 1

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