Lower logging by AnnotatedPartialOutputsError to DEBUG.

It should be the responsibility of higher-level catching code to
decide whether to log loudly or re-raise instead.

python/lsst/pipe/base/_status.py

@@ -202,7 +202,7 @@ def runQuantum(self, butlerQC, inputRefs, outputRefs):
                 continue
             item.metadata.set_dict("failure", failure_info)  # type: ignore
 
-        log.exception(
+        log.debug(
             "Task failed with only partial outputs; see exception message for details.",
             exc_info=error,
         )