Don't attempt to override compat changes on user builds.

This is not allowed and causes the test to fail. Instead of
deleting the test, skip it on user builds, so it will still run
on userdebug builds (e.g., in presubmit).

Fix: 233551762
Ignore-AOSP-First: AOSP tests target UDC and won't install on T
Test: CtsHostsideNetworkTests:com.android.cts.net.HostsideLinkPropertiesGatingTests on flame-user
Change-Id: I8a64b86700d250d5871639772e9e0721d93cceba