Update variable used to bypass the blocking check for multiple NuGet feeds for release pipeline (#19963)

tools/releaseBuild/azureDevOps/releasePipeline.yml

@@ -22,6 +22,8 @@ resources:
 variables:
   - name: runCodesignValidationInjection
     value : false
+  - name: nugetMultiFeedWarnLevel
+    value: none
   - name: NugetSecurityAnalysisWarningLevel
     value: none
   - name: skipComponentGovernanceDetection