Run test on both x64 and x86

[Youssef1313]

Closes #462 (The other disabled tests are tracked by #28639)
Closes #327 (please confirm this issue doesn't need any further actions).

[Youssef1313]

Re-triggering build. The failure is an unrelated network issue:

The operation has timed out.
System.Net.WebException: The operation has timed out.
   at System.Net.ConnectStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   at Microsoft.PowerShell.Commands.StreamHelper.WriteToStream(Stream input, Stream output, PSCmdlet cmdlet)
   at Microsoft.PowerShell.Commands.StreamHelper.SaveStreamToFile(Stream stream, String filePath, PSCmdlet cmdlet)
   at Microsoft.PowerShell.Commands.InvokeWebRequestCommand.ProcessResponse(WebResponse response)
   at Microsoft.PowerShell.Commands.WebRequestPSCmdlet.ProcessRecord()
at Ensure-ProcDump, D:\a\1\s\eng\build.ps1: line 580
at TestUsingRunTests, D:\a\1\s\eng\build.ps1: line 429
at <ScriptBlock>, D:\a\1\s\eng\build.ps1: line 711
at <ScriptBlock>, D:\a\_temp\e6ad85b9-298e-434e-84d9-6476ef3fcda8.ps1: line 3
at <ScriptBlock>, <No file>: line 1

[RikkiGibson]

Closes #462

Confused by this bit. It seems like solving this issue would involve also removing the x86 class from the tests. Did I miss something?

[Youssef1313]

@RikkiGibson There are other disabled tests that are tracked by #28639, so can't remove the x86 class in this PR.