show specific Jira connection error (baserow#4260)

Author: bram2w

enterprise/backend/src/baserow_enterprise/data_sync/jira_issues_data_sync.py

@@ -283,8 +283,8 @@ def _fetch_issues(self, instance, progress_builder: ChildProgressBuilder):
                 start_at += max_results
                 if data["total"] <= start_at:
                     break
-        except (RequestException, UnacceptableAddressException, ConnectionError):
-            raise SyncError("Error fetching issues from Jira.")
+        except (RequestException, UnacceptableAddressException, ConnectionError) as e:
+            raise SyncError(f"Error connecting to Jira: {str(e)}")
 
         return issues