build: add a couple more signing variables to ESRP (#37328)

This is in support of some identity changes we need to make.

.pipelines/v2/release.yml

@@ -88,6 +88,8 @@ extends:
                 akvName: $(SigningAKVName)
                 authCertName: $(SigningAuthCertName)
                 signCertName: $(SigningSignCertName)
+                useManagedIdentity: $(SigningUseManagedIdentity)
+                clientId: $(SigningOriginalClientId)
               # Have msbuild use the release nuget config profile
               additionalBuildOptions: /p:RestoreConfigFile="$(Build.SourcesDirectory)\.pipelines\release-nuget.config"
               beforeBuildSteps:

.pipelines/v2/templates/steps-esrp-signing.yml

@@ -19,4 +19,6 @@ steps:
       AuthAKVName: ${{ parameters.signingIdentity.akvName }}
       AuthCertName: ${{ parameters.signingIdentity.authCertName }}
       AuthSignCertName: ${{ parameters.signingIdentity.signCertName }}
+      UseMSIAuthentication: ${{ coalesce(parameters.signingIdentity.useManagedIdentity, 'false') }}
+      EsrpClientId: ${{ parameters.signingIdentity.clientId }}
       ${{ insert }}: ${{ parameters.inputs }}