"bazel run codeowners" is used to both:

• generate github codeownership file
• performs codeownership validation checks (e.g. all new files must be owned by someone )

During the execution of the second task, the command need to fetch updated git history from remote mongo repo for the master branch. The problem is that instead of fetching the git history only for the master branch we perform an unfiltered fetch that will attempt to donwload all the branches present in the remote repo. Currently, the mongodb repo contains almost 10'000 branches.