Fix flake in GkiInstallTest

Also add more logs.

This change fixes the following flakes:
- Ensure that the device is booted completely before interacting
  with it. Otherwise, it may error out with the `package` service
  not available, states not initialized, etc.

- Extend the timeout for `adb install` of the APEX. Otherwise, it
  may sometimes timeout.

Test: atest -vv --rerun-until-failure 10 GkiInstallTest 2>&1
Bug: 174126387

Change-Id: I21720f5bb80c35b63bca5bad3002186348d6cee3
1 file changed