MAINT-9049 [EAM] Allow adding multiple avatars to the list, ignoring inappropriate one for that list if it was selected

Roll back optimization that breaks cubemap updates

Approved-by: Andrey Lihatskiy <andreylproductengine@lindenlab.com>

Roll back optimization that isn't needed for sky rendering when atmospherics are used, but is needed for cubemap update.

MAINT-8718 FIXED EAM can't add or remove agent to or from Allowed, Banned list for All Estates on the first try

MAINT-8260 make TextureLoadFullRes not persistent to avoid issues with accidentally setting it on systems which cannot handle the mem load it implies