fix(max): Allow using feature enrollment events

[Twixes]

Problem

I wanted to analyze early access feature opt-ins with Max, but the $feature_enrollment_update event was explicitly excluded.

Changes

$feature_enrollment_update is now supported, with a little extra context.

How did you test this code?

TODO

[greptile-apps]

PR Summary

This PR enables the $feature_enrollment_update event for analysis with Max, the PostHog AI assistant, by removing the ignored_in_assistant flag from its taxonomy definition.

• Updated the description of $feature_enrollment_update in /posthog/taxonomy/taxonomy.py to provide more context about its purpose
• Added clarification that this event is specific to the PostHog Early Access Features product
• Removed the ignored_in_assistant: True flag to make the event available for Max analysis

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