feat(editor): Add functionality to delete and rename folders (no-changelog)

[MiloradFilipovic]

Summary

• Implementing Delete Folder functionality
• Implementing rename folder functionality

Other fixes/improvements

• Folder cards now show both sub-folder and workflow counts
• Better error handling around workflow/folder fetching

Related Linear tickets, Github issues, and Community forum posts

Closes ADO-3159 Closes ADO-3158

Review / Merge checklist

• [ ] PR title and summary are descriptive. (conventions)
• [ ] Docs updated or follow-up ticket created.
• [ ] Tests included.
• [ ] PR Labeled with release/backport (if the PR is an urgent fix that needs to be backported)