Reenable Installer Validation using Latest Official WindowsAppSDK builds (#4578)

* Reenable Installer Validation

* sanity check

* FIX

* remove comment

* COmments

build/AzurePipelinesTemplates/WindowsAppSDK-BuildInstaller-Steps.yml

@@ -24,8 +24,9 @@ steps:
       targetPath: '$(System.ArtifactsDirectory)'
 - ${{ else }}:
   ###
-  # This step downloads the WindowsAppSDK NuGet package from last successful or failed build of the Aggregator's Nightly build
-  # for use in building the installers
+  # This step downloads the WindowsAppSDK NuGet package from a pipeline
+  # variables: OfficialPipelineID LatestOfficialBuildID
+  # for use in building the Installers
   - task: DownloadPipelineArtifact@2
     displayName: 'Download WindowsAppSDK From Latest Nightly'
     inputs:
@@ -33,11 +34,8 @@ steps:
       targetPath: '$(System.ArtifactsDirectory)'
       source: 'specific'
       project: $(System.TeamProjectId)
-      allowPartiallySucceededBuilds: True
-      allowFailedBuilds: True
-      pipeline: 118002         
-      runVersion: 'latestFromBranch'
-      runBranch: "refs/heads/main"
+      pipeline: $(OfficialPipelineID) 
+      pipelineId: $(LatestOfficialBuildID) 
 
 ###
 # Install the internal licensing support for release-signed packages. This can always be present in

build/ProjectReunion-BuildFoundation.yml

@@ -16,8 +16,7 @@ variables:
 - template: ..\eng\common\AzurePipelinesTemplates\WindowsAppSDK-GlobalVariables.yml
 
 stages:
-# Disabling this because it is sensitive to failures on the Aggregator Nightly Build
-# - template: AzurePipelinesTemplates\WindowsAppSDK-BuildInstaller-Stage.yml@self
+- template: AzurePipelinesTemplates\WindowsAppSDK-BuildInstaller-Stage.yml@self
 
 - template: AzurePipelinesTemplates\WindowsAppSDK-Build-Stage.yml@self
   parameters: