feat: add a common upload endpoint (#7806)

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>

app/javascript/dashboard/store/modules/helpCenterArticles/specs/action.spec.js

@@ -1,6 +1,10 @@
 import axios from 'axios';
 import { actions } from '../actions';
 import * as types from '../../../mutation-types';
+import { uploadFile } from 'dashboard/helper/uploadHelper';
+
+jest.mock('dashboard/helper/uploadHelper');
+
 const articleList = [
   {
     id: 1,
@@ -180,4 +184,36 @@ describe('#actions', () => {
       ]);
     });
   });
+
+  describe('attachImage', () => {
+    it('should upload the file and return the fileUrl', async () => {
+      // Given
+      const mockFile = new Blob(['test'], { type: 'image/png' });
+      mockFile.name = 'test.png';
+
+      const mockFileUrl = 'https://test.com/test.png';
+      uploadFile.mockResolvedValueOnce({ fileUrl: mockFileUrl });
+
+      // When
+      const result = await actions.attachImage({}, { file: mockFile });
+
+      // Then
+      expect(uploadFile).toHaveBeenCalledWith(mockFile);
+      expect(result).toBe(mockFileUrl);
+    });
+
+    it('should throw an error if the upload fails', async () => {
+      // Given
+      const mockFile = new Blob(['test'], { type: 'image/png' });
+      mockFile.name = 'test.png';
+
+      const mockError = new Error('Upload failed');
+      uploadFile.mockRejectedValueOnce(mockError);
+
+      // When & Then
+      await expect(actions.attachImage({}, { file: mockFile })).rejects.toThrow(
+        'Upload failed'
+      );
+    });
+  });
 });