Pass "is official build" variable to AllConfigurations leg in the official build. (#93078)

Author: jkoritzinsky

eng/pipelines/runtime-official.yml

@@ -562,6 +562,7 @@ extends:
           jobParameters:
             buildArgs: -s tools+libs -allConfigurations -c $(_BuildConfig) /p:TestAssemblies=false /p:TestPackages=true
             nameSuffix: Libraries_AllConfigurations
+            isOfficialBuild: ${{ variables.isOfficialBuild }}
             postBuildSteps:
               - template: /eng/pipelines/common/upload-intermediate-artifacts-step.yml
                 parameters: