Add glanceable hub to large-screen lockscreen shortcut default behind flag

This flag will also be used for guarding other glanceable hub v2
resources.

Bug: 380335989
Bug: 383391342
Bug: 384119565
Test: verified by flipping flag on local build
Flag: com.android.systemui.glanceable_hub_v2_resources
Change-Id: Ife81ed3e6e7fcbd578a67fd74ba19cea29a8032d