Remove machine state modifications on Unix (#42100)

Changing /proc/sys/kernel/core_pattern is handled by core-eng and should not be done by helix consuming repositories. Also removing a workaround that has been fixed since (__CrashDumpFolder=/cores) on macOS. Also removing ulimit which is handled by core-eng as well.

Co-authored-by: Viktor Hofer <[email protected]>

src/coreclr/tests/helixpublishwitharcade.proj

@@ -248,11 +248,8 @@
     <HelixPreCommand Include="export __TestEnv=$HELIX_WORKITEM_PAYLOAD/$(TestEnvFileName)" />
     <HelixPreCommand Include="export __TestTimeout=$(TimeoutPerTestInMilliseconds)" Condition=" '$(TimeoutPerTestInMilliseconds)' != '' " />
     <HelixPreCommand Include="export __CollectDumps=1" />
-    <HelixPreCommand Include="export __CrashDumpFolder=$HELIX_DUMP_FOLDER" Condition=" '$(TargetOS)' != 'OSX' " />
-    <HelixPreCommand Include="export __CrashDumpFolder=/cores" Condition=" '$(TargetOS)' == 'OSX' " /> <!-- Helix doesn't specify the dump folder for OSX 10.14, so we need to manually specify it. Tracked by dotnet/core-eng#7872 -->
+    <HelixPreCommand Include="export __CrashDumpFolder=$HELIX_DUMP_FOLDER" />
     <HelixPreCommand Include="cat $__TestEnv" />
-    <HelixPreCommand Include="sudo bash -c 'echo $HELIX_DUMP_FOLDER/core.%u.%p > /proc/sys/kernel/core_pattern'" Condition=" '$(TargetOS)' != 'OSX' " />
-    <HelixPreCommand Include="ulimit -c unlimited" Condition=" '$(TargetOS)' == 'OSX' " />
   </ItemGroup>
 
   <PropertyGroup>