UTF-8 to ASCII-8BIT errors with Gitaly::GetTreeEntriesRequest

Conversation: gitaly#320 (closed)

https://sentry.gitlap.com/gitlab/gitlabcom/issues/42640/

Encoding::UndefinedConversionError: U+30B2 from UTF-8 to ASCII-8BIT
  lib/gitlab/gitaly_client/commit_service.rb:64:in `initialize'
    request = Gitaly::GetTreeEntriesRequest.new(
  lib/gitlab/gitaly_client/commit_service.rb:64:in `new'
    request = Gitaly::GetTreeEntriesRequest.new(
  lib/gitlab/gitaly_client/commit_service.rb:64:in `tree_entries'
    request = Gitaly::GetTreeEntriesRequest.new(
  lib/gitlab/git/tree.rb:23:in `block in where'
    client.tree_entries(repository, sha, path)
  lib/gitlab/gitaly_client.rb:95:in `block in migrate'
    yield is_enabled
...
(227 additional frame(s) were not displayed)

ActionView::Template::Error: U+30B2 from UTF-8 to ASCII-8BIT

ActionView::Template::Error: U+30B2 from UTF-8 to ASCII-8BIT