Closes #17256: Fix translation support in VLAN group scope assignment form

[jeremystretch]

Fixes: #17256

• Convert VLANGroupForm to use a single dynamically-rendered scope field
• Ditch an entire TypeScript module dedicated to displaying the old form 🎉

[arthanson]

It's not working for me, I switched branches to this, cleared cache and reloaded then go to add a VLan Group, selecting scope-type to location doesn't change the form:

[jeremystretch]

Changing the scope type should reset the list of choices in the "scope" field below it. (We're only using a single field now with a selector modal, regardless of the type.)

[arthanson]

Not sure if an issue - but if you edit and change the scope-type the scope is not cleared, so if you have id's between the different tables that are the same you will automatically get the item in the new table with the same id. Not sure if it would be better to clear the scope on scope-type change?