fix: remove funnel trends incorrect heuristic

[aspicer]

Problem

Event filtering heuristic breaks for trends that have multiple first steps in a row that fall in different intervals. This is especially bad in unordered trends, because any event can be the first event.
Reported here: https://posthog.slack.com/archives/C045L1VEG87/p1744047732992239

Changes

Remove the event filtering for trends

How did you test this code?

Wrote a test for it.

[greptile-apps]

PR Summary

This PR fixes a bug in funnel trends analysis by removing the event filtering heuristic that was causing issues with unordered trends having multiple first steps across different time intervals.

• Removed the udf_event_array_filter method from funnel_trends_udf.py and now passes the raw events_array directly to the funnel aggregation function
• Added a comprehensive test case in test_funnel_unordered.py that verifies correct conversion rates for users with varying event patterns across multiple days
• The fix is particularly important for unordered funnels where any event can be the first step, making the previous filtering approach problematic
• Test creates 5 users with different patterns of event occurrences to thoroughly validate the solution works across various scenarios
• Addresses a customer-reported issue where trends analysis was breaking when events spanned different time intervals

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