feat: Spread partitioning for personless overflow

[benjackwhite]

Problem

We don't want to keep hot partition issues for overflow if we don't do person processing for some data

Changes

• Fixes it

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

How did you test this code?

[greptile-apps]

PR Summary

This PR refactors overflow routing logic to improve partitioning for personless events while preserving locality for standard processing. It updates both the overflow assignment in the ingestion consumer and adjusts tests to cover new routing behavior.

• Updated /plugin-server/src/ingestion/ingestion-consumer.ts to compute a new preserveLocality flag for overflow events based on the SKIP_PERSONS_PROCESSING_BY_TOKEN_DISTINCT_ID setting.
• Modified /plugin-server/src/ingestion/ingestion-consumer.test.ts tests to assert correct key assignments and routing for both personless and standard events.

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