Funnel improvements - Graph type, identical steps, UI updates

[paolodamico]

Changes

This PR implements a few improvements to funnels and insights in general:

1. We now show information about duplicate and sequential steps (closes Explain how identical funnel steps work in the UI #5088)

2. Filters & breakdown are now split into a separate card following the mockups for this.

3. The "Add filter", "Add breakdown" & "Add formula" buttons across all insights are now links instead of a default button.

4. We implement a brand new graph type selector that looks good even on narrow screens (closes Improve funnels graph type selector #5235).

Checklist

• All querysets/queries filter by Organization, by Team, and by User
• Django backend tests
• Jest frontend tests
• Cypress end-to-end tests
• Migrations are safe to run at scale (e.g. PostHog Cloud) – present proof if not obvious
• New/changed UI is decent on smartphones (viewport width around 360px)

[paolodamico]

@clarkus one thing I'm not sure about is how the new link type button displays in certain contexts, see below (spacing looks strange), wdyt?

[clarkus]

These changes look good to me. Regarding the link placement, in this type of layout, I generally try to align with the input value. It's like that link has the same box properties as the form above it, just without color values.

[paolodamico]

@alexkim205 could you help me out with a code review and maybe just address this aligning improvement? I'm swamped in other issues right now

[alexkim205]

• Added an arrow to mimic our property filter nesting in other insight graphs
• Aligned 'Add new filter' to text

CC @clarkus @paolodamico