exp: pass -v loglevel into dvc-task workers

dvc/repo/experiments/queue/celery.py

@@ -125,6 +125,7 @@ class LocalCeleryQueue(BaseStashQueue):
             without_mingle=True,
             without_gossip=True,
             timeout=10,
+            loglevel="debug" if logger.getEffectiveLevel() <= logging.DEBUG else "info",
         )
 
     def _spawn_worker(self, num: int = 1):
@@ -143,6 +144,8 @@ class LocalCeleryQueue(BaseStashQueue):
         if num == 1:
             # automatically run celery cleanup when primary worker shuts down
             cmd.append("--clean")
+        if logger.getEffectiveLevel() <= logging.DEBUG:
+            cmd.append("-v")
         name = f"dvc-exp-worker-{num}"
 
         logger.debug("start a new worker: %s, node: %s", name, node_name)