Add some reserved guids

[diox]

Fixes: mozilla/addons#15423
Fixes: mozilla/addons#15424

There was some pushback against having a wildcard in there during triage meeting so I didn't go that far.

[KevinMind]

I'm not totally sure what I'm looking at. Can you add some additional context?

[diox]

RESERVED_ADDON_GUIDS are guids (technically guid suffixes) that regular users can't use for their add-ons on AMO. Uploading a new add-on (*) with such a guid results in an error, unless you belong to a group with the specific SystemAddon:Submit permission. (See reserved_guid_addon_submission_allowed())

This is done for various reasons, but the one we care about here is to avoid any potential conflicts with internal/synthetic add-ons that are never going to be submitted on AMO.

(*) new versions of an existing add-on are always permitted, to account for the fact that some of these guids used to be accepted in the past.