Fix optprof runs in light of nuget security check

Author: AArnott

azure-pipelines/OptProf.yml

@@ -33,6 +33,8 @@ variables:
 - name: SignType
   value: real
 - group: Library.Template
+- name: NugetSecurityAnalysisWarningLevel
+  value: none # nuget.config requires signed packages by trusted owners
 
 stages:
 - stage: Library