Merge "Add Data Saver utils in Firewall test helper class" into main am: 90428539d6

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2804117

Change-Id: I0107dcd62c7bbfd0b1405b9ceab94f010cdacf45
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>