Enable WinML by default in ADO pipelines (microsoft#1755)

- Enable WinML by default in ADO pipelines for nuget and python.

Author: chrisdMSFT

.pipelines/nuget-publishing.yml

@@ -56,7 +56,7 @@ parameters:
   - name: enable_winml
     displayName: 'Whether Windows WinML package is built.'
     type: boolean
-    default: false
+    default: true
 
   - name: ort_version
     displayName: 'OnnxRuntime version'

.pipelines/pypl-publishing.yml

@@ -47,7 +47,7 @@ parameters:
   - name: enable_winml
     displayName: 'Whether Windows WinML package is built for x64 and arm64'
     type: boolean
-    default: false
+    default: true
 
   - name: ort_winml_version
     displayName: 'Microsoft.WindowsAppSDK.ML Version (should match CMakeList.txt)'