Remove unused cache_root property from commit retriever and microannotate generator scripts

scripts/commit_retriever.py

@@ -13,8 +13,6 @@ logger = getLogger(__name__)
 
 class Retriever(object):
     def __init__(self, cache_root):
-        self.cache_root = cache_root
-
         assert os.path.isdir(cache_root), f"Cache root {cache_root} is not a dir."
         self.repo_dir = os.path.join(cache_root, "mozilla-central")
 

scripts/microannotate_generator.py

@@ -24,7 +24,6 @@ COMMITS_STEP = 5000
 
 class MicroannotateGenerator(object):
     def __init__(self, cache_root, repo_url, tokenize, remove_comments):
-        self.cache_root = cache_root
         self.repo_url = repo_url
         self.git_repo_path = os.path.basename(self.repo_url)
         self.tokenize = tokenize