feat(hogql): Add funnels to paths insight

[thmsobrmlr]

Problem

This PR builds upon #21044 to add funnels to paths insights.

Changes

Changes:

• Uses a funnelPathsFilter as schema key to hold all relevant params. Removes other params from the query schema and adapts filterToQuery functions to accomodate this.
• Uses a toTimeZone(timestamp, 'UTC') to fix issues with adding an interval and DST transitions.

How did you test this code?

Verified the funnel path can be added and removed locally.

[github-actions]

Size Change: 0 B

Total Size: 824 kB

ℹ️ View Unchanged

Filename	Size
frontend/dist/toolbar.js	824 kB

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[mariusandra]

Didn't review very deeply, but looks good overall

[webjunkie]

For me it doesn't work anymore to go to the paths from funnels, e.g. by clicking "Show user paths after step". I suspect the URL with the filter is not converted correctly anymore. We can also discuss in standup what the status is here.

[webjunkie]

I was able to fix the issues and would merge this. Then we can check #20057 for tests and possibly fix leftover issues.

[thmsobrmlr]

I was able to fix the issues and would merge this. Then we can check #20057 for tests and possibly fix leftover issues.

Awesome, go for it!