fix: blockquote icon in slash menu (#13068)

This PR fixes a UI bug where the "Quote" item in the slash command menu
was displayed without an icon.


The root cause was that the IconBlockquote component, while available in
the icons library, was not being exported from the internal twenty-ui
package.

## Before / After


![Before](https://github.com/user-attachments/assets/afd5e848-b6a4-4af9-a01d-15c6128f8535)


![After](https://github.com/user-attachments/assets/2468371f-fdd6-42a0-b04b-61a51d286746)


## Changes:

- Exported IconBlockquote from TablerIcons.ts in the twenty-ui package.
- Updated getSlashMenu.ts in the twenty-front package to import and use
the IconBlockquote for the "Quote" menu item.

packages/twenty-front/src/modules/activities/blocks/utils/getSlashMenu.ts

@@ -4,6 +4,7 @@ import { SuggestionItem } from '@/ui/input/editor/components/CustomSlashMenu';
 
 import { BLOCK_SCHEMA } from '../constants/Schema';
 import {
+  IconBlockquote,
   IconCode,
   IconComponent,
   IconFile,
@@ -25,6 +26,7 @@ const Icons: Record<string, IconComponent> = {
   'Heading 1': IconH1,
   'Heading 2': IconH2,
   'Heading 3': IconH3,
+  Quote: IconBlockquote,
   'Numbered List': IconListNumbers,
   'Bullet List': IconList,
   'Check List': IconListCheck,