[automerge] Refactors common scope id setup code into utility function 2p: f93a9ddc91

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/22905139

Bug: 279691947
Change-Id: Id10ffae360e1ebde49b51a11f23ff6bc1d605cad
Merged-In: I5627037c95b5b9cf4af46018bccffb4f16b402a8