Fix ExtractWindowsAppSDKVersion to only look at WindowsAppSDK nupkg (#4629)

* Fix ExtractWindowsAppSDKVersion to only look at WindowsAppSDK nupkg

* Fix typo

Author: JesseCol

build/AzurePipelinesTemplates/WindowsAppSDK-BuildVSIX-Steps.yml

@@ -57,7 +57,7 @@ steps:
       foreach ($file in $files) # Iterate through each package we restored in the directory
       {
         Write-Host "file:" $file.FullName
-        $nupkgPaths = Get-ChildItem $file.FullName -Filter "*.nupkg"
+        $nupkgPaths = Get-ChildItem $file.FullName -Filter "*WindowsAppSDK*.nupkg"
 
         # Extract nupkg to access the nuspec
         # The files in this directory does not contain the nuspec by default
@@ -236,4 +236,4 @@ steps:
   - task: PublishBuildArtifacts@1
     inputs:
       PathtoPublish: '$(ob_outputDirectory)'
-      artifactName: '$(ob_artifactBaseName)'
+      artifactName: '$(ob_artifactBaseName)'