Disable additional llvmfullaot Linux_arm64 CI lane (dotnet#60730)

Missed excluding this configuration in dotnet#60576

Co-authored-by: Steve Pfister <steve.pfister@microsoft.com>

Author: steveisok

eng/pipelines/runtime.yml

@@ -1107,7 +1107,8 @@ jobs:
     runtimeFlavor: mono
     platforms:
     - Linux_x64
-    - Linux_arm64
+    # Disabled pending outcome of https://github.com/dotnet/runtime/issues/60234 investigation
+    #- Linux_arm64
     helixQueueGroup: pr
     helixQueuesTemplate: /eng/pipelines/coreclr/templates/helix-queues-setup.yml
     jobParameters: