branch_name Sentry Errors

https://sentry.gitlap.com/gitlab/gitlabcom/issues/42930/

Conversation: gitaly#220 (closed)

GRPC::Unknown: 2:exit status 128
  lib/gitlab/gitaly_client/ref_service.rb:77:in `each'
    response.flat_map { |message| message.names.map { |name| yield(name) } }
  lib/gitlab/gitaly_client/ref_service.rb:77:in `flat_map'
    response.flat_map { |message| message.names.map { |name| yield(name) } }
  lib/gitlab/gitaly_client/ref_service.rb:77:in `consume_refs_response'
    response.flat_map { |message| message.names.map { |name| yield(name) } }
  lib/gitlab/gitaly_client/ref_service.rb:35:in `branch_names'
    consume_refs_response(response) { |name| Gitlab::Git.branch_name(name) }
  lib/gitlab/gitaly_client/ref_service.rb:58:in `count_branch_names'
    branch_names.count
...
(210 additional frame(s) were not displayed)

Gitlab::Git::CommandError: 2:exit status 128
  lib/gitlab/git/repository.rb:717:in `rescue in gitaly_migrate'
    raise CommandError.new(e)
  lib/gitlab/git/repository.rb:713:in `gitaly_migrate'
    Gitlab::GitalyClient.migrate(method, &block)
  lib/gitlab/git/repository.rb:129:in `branch_count'
    gitaly_migrate(:branch_names) do |is_enabled|
  app/models/repository.rb:519:in `branch_count'
    delegate :branch_count, :tag_count, to: :raw_repository
  lib/gitlab/metrics/instrumentation.rb:156:in `block in _uncached_branch_count'
    trans.method_call_for(#{label.to_sym.inspect}).measure { super }
...
(196 additional frame(s) were not displayed)

Gitlab::Git::CommandError: 2:exit status 128