Set apex_available for test_framework-sdkextensions am: c7a0b4273e am: 2f037f0061

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/SdkExtensions/+/11757801

Change-Id: I338069aed03167b1ed7d587c7afcf4d4a3000c38