fix(trends): fallback to event data for distinct_ids of personless events

[thmsobrmlr]

Problem

Personless events do not have a person profile. Since we use the person profile to look up distinct_ids in the actor query, these actors appear without distinct_ids:

Changes

This PR adds a fallback to distinct_ids of the underlying events, starting with the trends query. This will need to be implemented for other query types as well.

How did you test this code?

Tested locally. The actors and trend queries have many layers of abstraction, hoping eventual issues will be caught in CI.

[sentry-io]

Suspect Issues

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

• ‼️ IndexError: tuple index out of range posthog.tasks.exporter.export_asset View Issue
• ‼️ IndexError: tuple index out of range posthog.tasks.tasks.process_query_task View Issue

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