Switch the editor over to the apiserver by default

[pbiggar]

Some users would like to try the v2 canvas. We would also like some users to try this.

There are two parts to this:

• loading the /a/ route from ApiServer
• calling the api

Switching /a/ over

To allow users to switch over, we could provide a new route that routes to F#

• make a new route that points to the apiserver: /a-testing-fsharp/CANVASNAME
  • add to ingress
  • add to apiserver

To fully switch the /a/CANVASNAME route to the Apiserver, while still allowing /api/CANVASNAME to go to OCaml, we would need:

• port all the functions (or at least have their metadata listed).
• fix issues that come up ()
• test top 50 canvases to check if they still load
• switch /a/CANVASNAME to apiserver by default

Users don't care too much about this, it's just loading a page. So maybe the second part is more important.

Switching /api/ over

If we add a ?fsharp-backend option to the client, it could use a different api, perhaps /api-private-for-testing-only/

This allows the user to opt-in for API calls.

• add to the client
• add api routes to the ingress

[pbiggar]

• Relies on Canvas loads are too slow #3540 as well

[pbiggar]

• There's a current issue that the ApiServer doesn't load due to blazor in some cases, so waiting for this to pass before we can declare this done.

[pbiggar]

Finished this in #3619.