Fixed backfill query cli destination table name (#4123)

* Fixed desintation table

* Added check for destination table

bigquery_etl/cli/query.py

@@ -490,13 +490,19 @@ def _backfill_query(
     backfill_date = backfill_date.strftime("%Y-%m-%d")
     if backfill_date not in exclude:
         if destination_table is None:
-            destination_table = table
+            destination_table = f"{project}.{dataset}.{table}"
 
         if not no_partition:
             destination_table = f"{destination_table}${partition}"
 
+        if not QUALIFIED_TABLE_NAME_RE.match(destination_table):
+            click.echo(
+                "Destination table must be named like:" + " <project>.<dataset>.<table>"
+            )
+            sys.exit(1)
+
         click.echo(
-            f"Run backfill for {project}.{dataset}.{destination_table} "
+            f"Run backfill for {destination_table} "
             f"with @{date_partition_parameter}={backfill_date}"
         )