Fix icon and counter in custom fields settings

What does this MR do and why?

1. Remove edit button
2. Remove total count
3. Change Archive icon to Redo
4. Reset create custom field form after saving
5. Disable autocomplete on Name field (prevent browser dropdown with previous names)

How to test

1. Enable custom_fields_feature feature flag
2. Go to top level group, then Settings > Issues
3. Create some custom fields
4. Archive them
5. View the archived custom fields

Related to #521701 (closed)