Reraise KeyboardInterrupts and SystemExits during microbatch mode…

…l execution

Previously we were catching all execptions during microbatch model execution, and gracefully
handling them. This ensured that one failing batch didn't cause the rest of the batches to
fail / be skipped unnecessarily. However if there is a KeyboardInterrupt or SystemExit, execution
should halt. To get this to happen, we're now catching and reraising `KeybaordInterrupts`s and
`SystemExit`s.

core/dbt/task/run.py

@@ -568,6 +568,9 @@ def _execute_microbatch_materialization(
                 # At least one batch has been inserted successfully!
                 incremental_batch = True
 
+            except (KeyboardInterrupt, SystemExit):
+                # reraise it for GraphRunnableTask.execute_nodes to handle
+                raise
             except Exception as e:
                 exception = e
                 batch_run_result = self._build_failed_run_batch_result(