fix(experiments): clean query nodes for experiment insights

[thmsobrmlr]

Problem

We're planning to start rolling out HogQL funnel insights today. The new query endpoint is quite strict when validating the Pydantic schema of queries and does not allow additional properties. Since the updateQuerySource action merges the new query with any existing query, this can lead to invalid states e.g. when switching from trends to funnels in a new experiment:

Repro:

1. go to New experiment
2. change goal type to Conversion funnel
3. click Add funnel step

Changes

This PR remove the trendsFilter when changing to a funnels query and vice-versa.

How did you test this code?

Tried switching between trends and funnels for experiment metrics and secondary metrics locally

[github-actions]

Size Change: 0 B

Total Size: 824 kB

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frontend/dist/toolbar.js	824 kB

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[jurajmajerik]

🙏