Add support for annotations to the funnel historical trends insight

[thmsobrmlr]

Is your feature request related to a problem?

Annotations don't show up for funnel historical trends charts. See slack for more context.

Describe the solution you'd like

Annotations should show up like they do for other charts.

Describe alternatives you've considered

No feature parity :(

[joepavitt]

Just came here to request this too - would love to see it, all of our key metrics are Funnel history charts, and we have no direct context for why things may have changed, even though they're in our annotations

[Simon-Count]

Yup would like to see this too - seems like an obvious improvement :)

[abhagsain]

It's been one year :)

[thmsobrmlr]

Thanks for the ping @abhagsain ! Added it to the list of follow up items in a rewrite with funnels that's currently in progress: #19638

[joepavitt]

Did notice a duplicate here too btw: #20909

Just coming back to say we had another need for this today

[abigailbramble]

+1 https://posthoghelp.zendesk.com/agent/tickets/22897