Email-related housekeeping

[paolodamico]

Related to #1954, we need to do the following tasks for housekeeping / clear tech debt purposes:

• Remove UserMessagingRecord from posthog-production models in favor of the MessagingRecord model introduced in 201021 Fix weekly email report #1954.
• Create cron job to clean old records (e.g. > ~3 months old).
• Remove EMAIL_REPORTS_ENABLED config setting.

[paolodamico]

Point 1 should address the edge case reported by a user via email on Jan 13th in which they received the no-event-ingestion email because they created a cloud & self-hosted account but only used one.

[posthog-bot]

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[posthog-bot]

This issue was closed due to lack of activity. Feel free to reopen if it's still relevant.