feat(hogql): replace filters with query backend side

[thmsobrmlr]

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Problem

We want to replace filters with queries.

Changes

This PR replaces filters with a query (by converting them) based on a feature flag. This allows us to find places that break when replacing filters with queries.

Known issues after a quick test:

• [ ] Saving an insight does not work any more
• [ ] Dashboard tiles are layouted differently (they probably don't know that they are an insight or the nesting in InsightVizNode breaks them)

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

The flag should default to False in a self-hosted environment.

Todos

• [ ] nesting in insight viz node yes/no?
• [ ] migration check is broken?
• [ ] add tests
• [ ] test saving an insight
• [ ] test adding an insight to a dashboard
• [ ] test editing an insight
• [ ] test adding/editing/viewing a hogql insight

How did you test this code?

Be sure to start the dev server with POSTHOG_PERSONAL_API_KEY set.

[github-actions[bot]]

Size Change: -6 B (0%)

Total Size: 1.04 MB

ℹ️ View Unchanged

Filename	Size	Change
frontend/dist/toolbar.js	1.04 MB	-6 B (0%)

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[thmsobrmlr]

Closing in favour of https://github.com/PostHog/posthog/pull/21945