DO NOT MERGE: CTS to ensure non-system IME becoming device admin

CTS test that non-system app/IME cant injects KeyEvents on the Device
admin screen to become the device admin.

For the sake of simplicity, using CTS class to inject KeyEvent is
equivalent to using non-system IME.

Bug: 280793427
Test: atest DeviceAdminActivationTest

Change-Id: Ife4398691c56c47c0f25fbd94cbb4b6ccfcae18e
(cherry picked from commit 18c6a7cebb4544099d5b81d224fe8e8a34daef27)
1 file changed