feat: Ability to remove inbox avatar (#2885)

* Delete inbox avatar

1) New API endpoint added for deleting inbox avatar.
2) Delete avatar button in the inbox settings page.

Co-authored-by: Sojan Jose <sojan@pepalo.com>
Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>

app/javascript/dashboard/api/inboxes.js

@@ -13,6 +13,10 @@ class Inboxes extends ApiClient {
   getCampaigns(inboxId) {
     return axios.get(`${this.url}/${inboxId}/campaigns`);
   }
+
+  deleteInboxAvatar(inboxId) {
+    return axios.delete(`${this.url}/${inboxId}/avatar`);
+  }
 }
 
 export default new Inboxes();

app/javascript/dashboard/api/specs/inboxes.spec.js

@@ -27,5 +27,12 @@ describe('#InboxesAPI', () => {
         '/api/v1/inboxes/2/campaigns'
       );
     });
+
+    it('#deleteInboxAvatar', () => {
+      inboxesAPI.deleteInboxAvatar(2);
+      expect(context.axiosMock.delete).toHaveBeenCalledWith(
+        '/api/v1/inboxes/2/avatar'
+      );
+    });
   });
 });