Fix workspace folder deletion error (#13270)

context : workspace folder deletion throws error when folder does not
exist (in case, workspace users have not upload any files (profil pic,
workflows, attachments, ...))
-> sentry errors :
https://twenty-v7.sentry.io/issues/6565008010/?referrer=github_integration

solution : check folder existence before deleting

test local and s3 storage : 
- create a workspace and delete workspace
- create a workspace, add an attachment and delete workspace

closes : https://github.com/twentyhq/twenty/issues/10745
closes : https://github.com/twentyhq/twenty/issues/12299

packages/twenty-server/src/engine/core-modules/file/services/file.service.ts

@@ -93,6 +93,13 @@ export class FileService {
   async deleteWorkspaceFolder(workspaceId: string) {
     const workspaceFolderPath = `workspace-${workspaceId}`;
 
+    const isWorkspaceFolderFound =
+      await this.fileStorageService.checkFolderExists(workspaceFolderPath);
+
+    if (!isWorkspaceFolderFound) {
+      return;
+    }
+
     return await this.fileStorageService.delete({
       folderPath: workspaceFolderPath,
     });