E2E tests in the PR build have timeouts misconfigured

[Přemek Vysoký]

Seems like XHarness PR tests are getting killed:

[09:14:59] dbug: Xamarin.Hosting: Installing on iOS 13.5 (17F61) - iPhone X by executing 'xcrun simctl install 26D66A80-5E1F-4EF0-B6F4-06A31E986D2C /tmp/helix/working/B8B30A0C/w/A297092C/e/System.Numerics.Vectors.Tests.app'
./xharness-runner.apple.sh: line 165:  2485 Terminated: 15          source command.sh
/tmp/helix/working/B8B30A0C/p/scripts/e533168e17264b6db639ed1893961530/execute.sh: line 14:  2406 Killed: 9               ./xharness-helix-job.apple.sh --app "System.Numerics.Vectors.Tests.app" --target "ios-simulator-64" --command-timeout 720 --timeout "00:07:00" --launch-timeout "00:03:30" --includes-test-runner --expected-exit-code "0"
+ export _commandExitCode=137
+ _commandExitCode=137
+ /usr/local/bin/python3 -u /tmp/helix/working/B8B30A0C/w/A297092C/u/xharness-event-processor.py
['System.Numerics.Vectors.Tests' END OF WORK ITEM LOG: Command timed out, and was killed]

With no time to call the xharness-event-processor.py which would ask for a retry