chore: cleanup UI patterns exports (#47406)

## Problem

We now export components under a subpath in ui-patterns to avoid barrel
files as they slow down every tools (from IDE to linters, etc.) and may
also affect bundles our users have to download.

## Solution

- Remove the UI patterns index file
- Fix invalid impors

apps/docs/components/ProjectConfigVariables/ProjectConfigVariables.ComboBox.tsx

@@ -6,16 +6,16 @@ import {
   Button_Shadcn_ as Button,
   cn,
   Command,
-  CommandGroup as CommandGroup,
+  CommandGroup,
   CommandInput,
-  CommandItem as CommandItem,
-  CommandList as CommandList,
+  CommandItem,
+  CommandList,
   Popover,
   PopoverContent,
   PopoverTrigger,
   ScrollArea,
 } from 'ui'
-import ShimmeringLoader from 'ui-patterns/ShimmeringLoader'
+import { ShimmeringLoader } from 'ui-patterns/ShimmeringLoader'
 
 export interface ComboBoxOption {
   id: string