[FLINK-38601][connect/mongodb] Catch throwable errors when consuming from unbounded streams (#4213)

Co-authored-by: guoxuanlin <guoxuanlin@tencent.com>

Author: linguoxuan

flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mongodb-cdc/src/main/java/org/apache/flink/cdc/connectors/mongodb/source/reader/fetch/MongoDBStreamFetchTask.java

@@ -221,6 +221,10 @@ public void execute(Context context) throws Exception {
         } catch (Exception e) {
             LOG.error("Poll change stream records failed ", e);
             throw e;
+        } catch (Throwable t) {
+            // Handle error
+            LOG.error("Fatal error when polling change stream records: ", t);
+            throw new RuntimeException("Fatal error when polling change stream records", t);
         } finally {
             taskRunning = false;
             if (changeStreamCursor != null) {