Restore "Fix "Create profile" page not supporting dark mode (#8110)" & Fix string defaultValues during sync-metadata (#9220)

Restoring https://github.com/twentyhq/twenty/pull/9185
Also fixing sync-metadata with test values in jsonb

## Test
sync-metadata on existing workspaces should replace colorSchema in both
metadata and workspaceMember tables

packages/twenty-server/src/modules/workspace-member/standard-objects/workspace-member.workspace-entity.ts

@@ -98,7 +98,7 @@ export class WorkspaceMemberWorkspaceEntity extends BaseWorkspaceEntity {
     label: 'Color Scheme',
     description: 'Preferred color scheme',
     icon: 'IconColorSwatch',
-    defaultValue: "'Light'",
+    defaultValue: "'System'",
   })
   colorScheme: string;