Supress the error message when we kill the process.

src/dvc_task/proc/process.py

@@ -196,6 +196,8 @@ def wait(self, timeout: Optional[int] = None) -> Optional[int]:
             self._proc.wait(timeout=timeout)
         except subprocess.TimeoutExpired as exc:
             raise TimeoutExpired(exc.cmd, exc.timeout) from exc
+        except KeyboardInterrupt:
+            pass
         self.returncode = self._proc.returncode
         self._close_fds()
         self._dump()