[tune] change trial dir default to include name (#10608)

python/ray/tune/trial.py

@@ -607,9 +607,9 @@ class Trial:
         if self.custom_dirname:
             generated_dirname = self.custom_dirname
         else:
-            generated_dirname = f"{self.trainable_name}_{self.experiment_tag}"
+            generated_dirname = f"{str(self)}_{self.experiment_tag}"
             generated_dirname = generated_dirname[:MAX_LEN_IDENTIFIER]
-            generated_dirname += f"_{date_str()}{uuid.uuid4().hex[:8]}"
+            generated_dirname += f"_{date_str()}"
         return generated_dirname.replace("/", "_")
 
     def __getstate__(self):