removed check_timestamps_sync that is no longer used in the code,

removed tests in datasets related to check_timestamps_sync
added the use of `clear_episode_buffer` that was not used in `save_episode`
added the creation of the codebase_version tag that was missing in `slurm_upload`

examples/port_datasets/droid_rlds/slurm_upload.py

@@ -90,6 +90,8 @@ class UploadDataset(PipelineStep):
             )
             card.push_to_hub(repo_id=self.distant_repo_id, repo_type="dataset", revision=self.branch)
 
+            hub_api.create_tag(self.distant_repo_id, tag=CODEBASE_VERSION, repo_type="dataset")
+
         def list_files_recursively(directory):
             base_path = Path(directory)
             return [str(file.relative_to(base_path)) for file in base_path.rglob("*") if file.is_file()]