Chore: remove old insert menu (#5819)

The legacy `InsertMenu` component is not used anymore, so this PR
removes it and some related helpers.

**Manual Tests:**
I hereby swear that:

- [x] I opened a hydrogen project and it loaded
- [x] I could navigate to various routes in Preview mode

Fixes #5444

editor/src/components/canvas/canvas-strategies/strategies/drag-to-insert-metastrategy.tsx

@@ -58,6 +58,10 @@ import { wrapInContainerCommand } from '../../commands/wrap-in-container-command
 import type { InsertionPath } from '../../../editor/store/insertion-path'
 import { childInsertionPath } from '../../../editor/store/insertion-path'
 
+/**
+ * NOTE: this strategy was mostly used for legacy insert menu interactions, but it's kept
+ * intact since it's still used for image insertion from other places.
+ */
 export const dragToInsertMetaStrategy: MetaCanvasStrategy = (
   canvasState: InteractionCanvasState,
   interactionSession: InteractionSession | null,

editor/src/components/canvas/canvas-strategies/strategies/draw-to-insert-metastrategy.tsx

@@ -66,6 +66,14 @@ import { wildcardPatch } from '../../commands/wildcard-patch-command'
 import type { InsertionPath } from '../../../editor/store/insertion-path'
 import { childInsertionPath } from '../../../editor/store/insertion-path'
 
+/**
+ *
+ * NOTE: https://github.com/concrete-utopia/utopia/pull/5819 deleted a bunch of
+ * tests for this strategy that relied on the legacy insert menu.
+ *
+ * ! IF YOU WORK ON THIS, PLEASE RESURRECT THE TESTS AND MAKE THEM USE THE 'F' SHORTCUT !
+ *
+ */
 export const drawToInsertMetaStrategy: MetaCanvasStrategy = (
   canvasState: InteractionCanvasState,
   interactionSession: InteractionSession | null,