Revert "[CI] Support using blob prefix for downloading"

This reverts commit 4f6032f.
This reverts commit dff8788.

These are already using platform specific buckets so do not need to be
prefixed by the platform.

Author: boomanaiden154

.ci/cache_lit_timing_files.py

@@ -14,21 +14,16 @@
 import logging
 import multiprocessing.pool
 import pathlib
-import platform
 import glob
 
 from google.cloud import storage
 
 GCS_PARALLELISM = 100
 
 
-def _get_blob_prefix():
-    return f"lit_timing_{platform.system().lower()}"
-
-
 def _maybe_upload_timing_file(bucket, timing_file_path):
     if os.path.exists(timing_file_path):
-        timing_file_blob = bucket.blob(_get_blob_prefix() + "/" + timing_file_path)
+        timing_file_blob = bucket.blob("lit_timing/" + timing_file_path)
         timing_file_blob.upload_from_filename(timing_file_path)
 
 
@@ -48,14 +43,14 @@ def upload_timing_files(storage_client, bucket_name: str):
 
 
 def _maybe_download_timing_file(blob):
-    file_name = blob.name.removeprefix(_get_blob_prefix() + "/")
+    file_name = blob.name.removeprefix("lit_timing/")
     pathlib.Path(os.path.dirname(file_name)).mkdir(parents=True, exist_ok=True)
     blob.download_to_filename(file_name)
 
 
 def download_timing_files(storage_client, bucket_name: str):
     bucket = storage_client.bucket(bucket_name)
-    blobs = bucket.list_blobs(prefix=_get_blob_prefix())
+    blobs = bucket.list_blobs(prefix="lit_timing")
     with multiprocessing.pool.ThreadPool(GCS_PARALLELISM) as thread_pool:
         futures = []
         for timing_file_blob in blobs: