Don't kill test app following install

In some tests there is a race between starting the instrumentation and
killing the app after install, which causes this error:
```
Instrumentation run failed due to 'Process crashed.'
```

Bug: 396507989
Test: atest CtsDevicePolicyManagerTestCases:com.android.cts.devicepolicy.OrgOwnedProfileOwnerTest#testCanRelinquishControlOverDevice
Flag: EXEMPT test fix
Change-Id: Ic5af709e2877e5d3b478a1f8838c612f976b9e20