Revert "Annotate re-raised exception instead of logging it."

This reverts commit 7b1fce0.

This logging was duplicative when seen from STDERR, which also gets
exception tracebacks that propagate up, but we need error messages and
tracebacks to appear in the saved logs, too, and this is the only
place we can do that.

python/lsst/ctrl/mpexec/singleQuantumExecutor.py

@@ -268,7 +268,13 @@ def _execute(self, task_node: TaskNode, /, quantum: Quantum) -> Quantum:
             try:
                 self.runQuantum(task, quantum, task_node, limited_butler)
             except Exception as e:
-                e.add_note(f"Execution of task {task_node.label!r} on quantum {quantum.dataId} failed.")
+                _LOG.error(
+                    "Execution of task '%s' on quantum %s failed. Exception %s: %s",
+                    task_node.label,
+                    quantum.dataId,
+                    e.__class__.__name__,
+                    str(e),
+                )
                 raise
             logInfo(None, "end", metadata=quantumMetadata)  # type: ignore[arg-type]
             fullMetadata = task.getFullMetadata()