Revert "move fuzz from UtaskLocalExecutor to Utask (#4965)" it breaks platforms with pools. (#5069)

This reverts commit 74f530a.

Author: jonathanmetzman

src/clusterfuzz/_internal/bot/tasks/task_types.py

@@ -225,7 +225,7 @@ def execute(self, task_argument, job_type, uworker_env):
     'analyze': UTask,
     'blame': TrustedTask,
     'corpus_pruning': UTask,
-    'fuzz': UTask,
+    'fuzz': UTaskLocalExecutor,
     'impact': TrustedTask,
     'minimize': UTask,
     'progression': UTask,