GET /api/:version/repos/:namespace/:project/branches causes many Gitaly errors: Gitlab::Git::Repository::NoRepository

https://sentry.gitlab.net/gitlab/gitlabcom/issues/2606264/?referrer=gitlab_plugin

GRPC::NotFound: 5:GetRepoPath: not a git repository: "/var/opt/gitlab/git-data/repositories/@hashed/[redacted].git".
  grpc/generic/active_call.rb:29:in `check_status'
    fail GRPC::BadStatus.new_status_exception(
  grpc/generic/active_call.rb:180:in `attach_status_results_and_complete_call'
    recv_status_batch_result.check_status
  grpc/generic/active_call.rb:169:in `receive_and_check_status'
    attach_status_results_and_complete_call(batch_result)
  grpc/generic/active_call.rb:337:in `each_remote_read_then_finish'
    receive_and_check_status

Gitlab::Git::Repository::NoRepository: 5:GetRepoPath: not a git repository: "/var/opt/gitlab/git-data/repositories/@hashed/[redacted].git".
  gitlab/git/wraps_gitaly_errors.rb:9:in `rescue in wrapped_gitaly_errors'
    raise Gitlab::Git::Repository::NoRepository, e
  gitlab/git/wraps_gitaly_errors.rb:6:in `wrapped_gitaly_errors'
    def wrapped_gitaly_errors(&block)
  gitlab/git/repository.rb:131:in `local_branches'
    wrapped_gitaly_errors do
  repository.rb:770:in `local_branches'
    @local_branches ||= raw_repository.local_branches
  gitlab/metrics/instrumentation.rb:160:in `block in branches'
    .measure { super }
...
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