Switch OneBranch pipeline to only build and not test

Primarily this is because the end-to-end tests currently hang only on
OneBranch because the image still only has end-of-life PowerShell 7.3,
which we've dropped support for. But we need to do a release.

All the CI tests run on GitHub where we do our actual development and
their images are up-to-date so it all passes.

.pipelines/PowerShellEditorServices-Official.yml

@@ -93,7 +93,7 @@ extends:
               Install-Module -Repository CFS -Name Microsoft.PowerShell.PSResourceGet
               ./tools/installPSResources.ps1 -PSRepository CFS
             displayName: Install PSResources
-          - pwsh: Invoke-Build TestFull -Configuration $(BuildConfiguration) -PSRepository CFS
+          - pwsh: Invoke-Build Build -Configuration $(BuildConfiguration) -PSRepository CFS
             displayName: Build and test
           - task: PublishTestResults@2
             displayName: Publish test results