Fix Storybook Configuration for Windows Development Environment (#7904)

#### Description
This PR resolves issue #7903 regarding the Storybook configuration for
Windows development environments. Previously, the configuration script
generated forward slashes instead of backslashes, leading to errors when
running the command `npx nx run twenty-front:storybook:serve:dev
--configuration=modules` on Windows systems.

#### Changes Made
- Updated the Storybook configuration to ensure that backslashes are
used in file paths for Windows environments, preventing command
execution errors.

#### How to Test
1. **Run Storybook Command**:
   - On a Windows machine, execute the command:
     ```
     npx nx run twenty-front:storybook:serve:dev --configuration=modules
     ```
- Ensure that the command runs successfully without any path-related
errors.

2. **Verify Configuration**:
- Check the Storybook configuration files to confirm that paths are
using backslashes where applicable.
- Test the same command on non-Windows environments to verify that there
are no regressions.

#### Related Issue
- Fixes #7903

packages/twenty-ui/scripts/generateBarrels.js

@@ -1,5 +1,6 @@
 import * as fs from 'fs';
 import path from 'path';
+import slash from 'slash';
 
 const extensions = ['.ts', '.tsx'];
 const excludedExtensions = [
@@ -73,10 +74,10 @@ moduleDirectories.forEach((moduleDirectoryPath) => {
 
       return directFilesPaths.map((filePath) => {
         const fileName = filePath.split('.').slice(0, -1).join('.');
-        return `export * from './${path.relative(
+        return `export * from './${slash(path.relative(
           moduleDirectoryPath,
           path.join(directoryPath, fileName),
-        )}';`;
+        ))}';`;
       });
     })
     .sort((a, b) => a.localeCompare(b))
@@ -92,7 +93,7 @@ moduleDirectories.forEach((moduleDirectoryPath) => {
 const mainBarrelExports = moduleDirectories
   .map(
     (moduleDirectoryPath) =>
-      `export * from './${path.relative(srcPath, moduleDirectoryPath)}';`,
+      `export * from './${slash(path.relative(srcPath, moduleDirectoryPath))}';`,
   )
   .sort((a, b) => a.localeCompare(b))
   .join('\n');