XHarness Android device failure telemetry is not sent

[premun]

In case we do not have the isDevice key, we fail with following:

Analyzing android/test@None (85)
    Encountered ADB_DEVICE_ENUMERATION_FAILURE. This is typically not a failure of the work item. It will be run again. This machine will reboot to help its devices
    If this occurs repeatedly, please check for architectural mismatch, e.g. sending arm64_v8a APKs to an x86_64 / x86 only queue.
Traceback (most recent call last):
  File "C:\h\w\AF490986\w\AF34096B\u/xharness-event-processor.py", line 199, in <module>
    custom_dimensions['isDevice'] = 'true' if operation['isDevice'] else 'false'
KeyError: 'isDevice'

Full logs:
https://helixre8s23ayyeko0k025g8.blob.core.windows.net/dotnet-xharness-refs-pull-797-merge-e971a7215d6f4ea29d/System.Buffers.Tests-arm64-v8a/1/console.739c71a3.log?sv=2019-07-07&se=2022-01-10T10%3A03%3A43Z&sr=c&sp=rl&sig=bS0JDmiucPfzsr1h%2B50m%2Fa0hbVUJrbovPdWNFd5Vs28%3D