feat(core): experimental features ui (#5338)

fix TOV-280

experimental features ui
- enabled in the workspace settings for a cloud workspace; only show for workspace owner + early access
- a disclaimer prompt will be shown before going to the next feature setting page
- for now only show the ai poc switch, which controls the display of the ai tab in editor's sidepanel

packages/common/env/src/global.ts

@@ -29,7 +29,6 @@ export const runtimeFlagsSchema = z.object({
   enableEnhanceShareMode: z.boolean(),
   enablePayment: z.boolean(),
   enablePageHistory: z.boolean(),
-  enableCopilot: z.boolean(),
   // this is for the electron app
   serverUrlPrefix: z.string(),
   enableMoveDatabase: z.boolean(),