Remove legacy fallback to authoring.allowed
Remove legacy fallback to authoring.allowed

WARNING- this change can break configs; update to authoring.allowed
if this causes errors. Apologies for the incompatibility.

PiperOrigin-RevId: 328211216
Change-Id: I6c5e0ea0b19be8157d8865d0039d6435dcf673e9

google/copybara,google/copybara,google/copybara