fix: include owner role in gem owner

[gjtorikian]

What was the end-user or developer problem that led to this PR?

The gem owner command lists the owners of a gem but does not display their role. This makes it difficult for gem maintainers to see what level of access each person has.

What is your fix for the problem, implemented in this PR?

Display the owner's role in parentheses next to their identifier when listing gem owners, since that information now comes from the API.

Make sure the following tasks are checked

• Describe the problem / feature
• Write tests for features and bug fixes
• Write code to solve the problem
• Make sure you follow the current code style and write meaningful commit messages without tags

Closes #9267.

[hsbt]

👍

[tekknolagi]

FYI this broke ruby HEAD CI. See errors on ruby/ruby@3092f4f

[gjtorikian]

I guess the quickest fix would be to add a nil? guard to not append the role? The proper fix would be to update the test fixtures.

And why does matzbot merge directly into master instead of opening a PR? I have no context.

[hsbt]

This is alaready fixed.

ruby/ruby#16413

[tekknolagi]

Oh super! Thank you!