Merge "Update NetworkAgent#register to compatible with old NetworkAgentTest" into main am: f73d80b61c

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2849874

Change-Id: I5f46e65082aa262549552ccc4811e1c1d5211ce9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>