ProcessTests failing intermediately in CI on Nano

[weshaggard]

https://mc.dot.net/#/user/weshaggard/pr~2Fjenkins~2Fdotnet~2Fcorefx~2Fmaster~2F/test~2Ffunctional~2Fcli~2F/75982aa70a7e3b1b76bca26e6be7c315fda14505/workItem/System.Diagnostics.Process.Tests/analysis/xunit/System.Diagnostics.Tests.ProcessTests~2FGetProcessesByName_ProcessName_ReturnsExpected

   at System.Diagnostics.Tests.ProcessTests.GetProcessesByName_ProcessName_ReturnsExpected() in D:\j\workspace\windows-TGrou---74aa877a\src\System.Diagnostics.Process\tests\ProcessTests.cs:line 986

This test seems to be failing every other run or so in my PR. My PR (dotnet/corefx#31436) is mostly infra changes so I don't expect those to have caused this test failure.