Force the test app into a non-idle state.

Otherwise, the app idle state could interfere
with the test verifications.

Bug: 317204099
Test: atest ./tests/cts/hostside/src/com/android/cts/net/HostsideNetworkCallbackTests.java
Change-Id: I057546082ffc2f6f5c8da8928824a5261d0f8c7f