Merge "Make FlaggedAPI available to CtsThreadNetworkTestCases" into main am: f652d2ca82

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2815930

Change-Id: I4a650454f4448dea3931f19bccc6ba5aca4a73a8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>