VMR: Temporarily disable tests on AzureLinux_x64_Cross_Mono (#45276)

Co-authored-by: Viktor Hofer <viktor.hofer@microsoft.com>

Author: akoeplinger

eng/pipelines/templates/stages/vmr-build.yml

@@ -771,6 +771,7 @@ stages:
             useMonoRuntime: true
             targetOS: linux
             targetArchitecture: x64
+            runTests: false  # scenario-tests time out: https://github.com/dotnet/source-build/issues/4775
 
         - template: ../jobs/vmr-build.yml
           parameters: