fix(publish): use correct workspace name in --json output

[florianloechle]

What's the problem this PR addresses?

Fixes #6946.

How did you fix it?

Use the structutils.stringifyIdent function to get the workspace name like other commands do.

Checklist

• [ x] I have read the Contributing Guide.

• [x ] I have set the packages that need to be released for my changes to be effective.

• [x ] I will check that all automated PR checks pass before the PR gets reviewed.