Add posix dmp copy command (#45704)

Author: Forgind

test/UnitTests.proj

@@ -121,7 +121,8 @@
       <HelixPreCommands Condition="!$(IsPosixShell)">call %HELIX_CORRELATION_PAYLOAD%\t\RunTestsOnHelix.cmd $(TestFullMSBuild);$(HelixPreCommands)</HelixPreCommands>
       <HelixPreCommands Condition="$(IsPosixShell)">. $HELIX_CORRELATION_PAYLOAD/t/RunTestsOnHelix.sh;$(HelixPreCommands)</HelixPreCommands>
       <HelixPostCommands Condition="!$(IsPosixShell)">PowerShell -ExecutionPolicy ByPass "dotnet nuget locals all -l | ForEach-Object { $_.Split(' ')[1]} | Where-Object{$_ -like '*cache'} | Get-ChildItem -Recurse -File -Filter '*.dat' | Measure";$(HelixPostCommands)</HelixPostCommands>
-      <HelixPostCommands>PowerShell -ExecutionPolicy ByPass "Get-ChildItem -Recurse -File -Filter '*hangdump.dmp' | Copy-Item -Destination $env:HELIX_WORKITEM_UPLOAD_ROOT";$(HelixPostCommands)</HelixPostCommands>
+      <HelixPostCommands Condition="!$(IsPosixShell)">PowerShell -ExecutionPolicy ByPass "Get-ChildItem -Recurse -File -Filter '*hangdump.dmp' | Copy-Item -Destination $env:HELIX_WORKITEM_UPLOAD_ROOT";$(HelixPostCommands)</HelixPostCommands>
+      <HelixPostCommands Condition="$(IsPosixShell)">find . -name '*hangdump.dmp' -exec cp {} "$HELIX_WORKITEM_UPLOAD_ROOT" \%3B;$(HelixPostCommands)</HelixPostCommands>
       <TestDotnetRoot>$(RepoRoot)artifacts\bin\redist\$(Configuration)\dotnet</TestDotnetRoot>
       <TestDotnetVersion>$(Version)</TestDotnetVersion>
       <MSBuildSdkResolverDir>$(RepoRoot)artifacts\bin\Microsoft.DotNet.MSBuildSdkResolver</MSBuildSdkResolverDir>