fix: elements chain not working

[aspicer]

Problem

In Autocapture, we have an event property called $elements_chain

$elements_chain isn't a real property though, it's a field on events.

However, we don't treat it like such, so it causes the event property to be useless.
ifNull(notILike(toString(replaceRegexpAll(nullIf(nullIf(JSONExtractRaw(events.properties, '$elements_chain'), ''), 'null'), '^"|"$', '')), '%div%'), 1)

Reported here:
https://posthoghelp.zendesk.com/agent/tickets/27104

Changes

Make it useful!

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

Yes

How did you test this code?

Wrote a test.

[greptile-apps]

PR Summary

This PR fixes the handling of $elements_chain property in Autocapture events by treating it as a direct column rather than a JSON property. Here are the key changes:

• Modified property_to_expr in posthog/hogql/property.py to handle $elements_chain as a direct column on events table
• Added test case in posthog/hogql_queries/test/test_events_query_runner.py to verify element chain filtering
• Improves query performance by avoiding JSON extraction for elements_chain field
• Fixes broken element chain filtering functionality reported in support ticket

The changes are focused and address a specific issue with element chain property handling in PostHog's event querying system.

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[greptile-apps]

style: Test only checks length of results. Consider verifying the actual content of the filtered results to ensure correct event was filtered out.

Suggested change

	self.assertEqual(len(response.results), 1)
	self.assertEqual(len(response.results), 1)
	self.assertNotIn('div', response.results[0][0]['elements_chain'])