Only output annotations properties in snapshots for T+

Marks the `scopeProperties.AnnotationsZip` property as only being
supported on T builds and above.

Bug: 204763318
Test: m nothing
Merged-In: Ie59396287c08da77a6a1f15d4be202429e011e17
Change-Id: Ie59396287c08da77a6a1f15d4be202429e011e17
(cherry picked from commit a54016c3)