Improve image upload error handling and validation (#17188)

- Add URL validation in getImageBufferFromUrl utility
- Add response status validation and content-type checking
- Add timeout and connection error handling with specific error messages
- Validate buffer is not empty before processing
- Validate file type detection results before proceeding
- Ensure detected file type is actually an image format
- Add proper type safety for Axios error handling

This improves robustness when uploading images from URLs by:
- Preventing invalid URLs from being processed
- Providing clear error messages for different failure scenarios
- Ensuring only valid image files are processed
- Handling network errors gracefully

---------

Co-authored-by: GitTensor Miner <miner@gittensor.io>

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

@@ -120,10 +120,22 @@ export class FileUploadService {
 
     const type = await FileType.fromBuffer(buffer);
 
+    if (!type || !type.ext || !type.mime) {
+      throw new Error(
+        'Unable to detect image type from buffer. The file may not be a valid image format.',
+      );
+    }
+
+    if (!type.mime.startsWith('image/')) {
+      throw new Error(
+        `Detected file type is not an image: ${type.mime}. Please provide a valid image URL.`,
+      );
+    }
+
     return await this.uploadImage({
       file: buffer,
-      filename: `${v4()}.${type?.ext}`,
-      mimeType: type?.mime,
+      filename: `${v4()}.${type.ext}`,
+      mimeType: type.mime,
       fileFolder,
       workspaceId,
     });