Move ARM64 Windows boxen to be Helix-provisioned (dotnet/coreclr#20204)

Commit migrated from https://github.com/dotnet/coreclr/commit/8502d4da3f8767eda617bdcc40741cbac089e981

diff --git a/src/coreclr/netci.groovy b/src/coreclr/netci.groovy
index 6d7e0aa..111141f 100755 (executable)
--- a/src/coreclr/netci.groovy
+++ b/src/coreclr/netci.groovy
@@ -762,7 +762,7 @@ def static setMachineAffinity(def job, def os, def architecture, def options = n
                 label('Windows.10.Amd64.ClientRS4.DevEx.Open')
             }
         } else {
-            Utilities.setMachineAffinity(job, os, 'arm64-windows_nt')
+            Utilities.setMachineAffinity(job, 'windows.10.arm64.open')
         }
     } else {
         assert os != 'Windows_NT'