Remove TestRelease (microsoft#5613)

## Change
The reason for this configuration and build step have been lost. If this
builds just fine, I think we are safe to remove it.

Author: JohnMcPMS

azure-pipelines.yml

@@ -50,12 +50,10 @@ jobs:
       x86_release:
         buildConfiguration: 'Release'
         buildPlatform: 'x86'
-        testBuildConfiguration: 'TestRelease'
         artifactIdentifier: 'x86release'
       x64_release:
         buildConfiguration: 'Release'
         buildPlatform: 'x64'
-        testBuildConfiguration: 'TestRelease'
         artifactIdentifier: 'x64release'
 
   variables:
@@ -123,19 +121,6 @@ jobs:
                     /p:UapAppxPackageBuildMode=SideloadOnly'
       maximumCpuCount: true
 
-  - task: VSBuild@1
-    displayName: Build Test Project
-    inputs:
-      platform: '$(buildPlatform)'
-      solution: '$(solution)'
-      configuration: '$(testBuildConfiguration)'
-      msbuildArgs: '/bl:$(artifactsDir)\msbuild-testProject.binlog
-                    /p:AppxBundlePlatforms="$(buildPlatform)"
-                    /p:AppxPackageDir="$(appxPackageDir)"
-                    /p:AppxBundle=Always
-                    /p:UapAppxPackageBuildMode=SideloadOnly'
-      maximumCpuCount: true
-
   - task: MSBuild@1
     displayName: Build MSIX Test Installer File
     inputs:
@@ -314,12 +299,10 @@ jobs:
       x86_release:
         buildConfiguration: 'Release'
         buildPlatform: 'x86'
-        testBuildConfiguration: 'TestRelease'
         artifactIdentifier: 'x86release'
       x64_release:
         buildConfiguration: 'Release'
         buildPlatform: 'x64'
-        testBuildConfiguration: 'TestRelease'
         artifactIdentifier: 'x64release'
 
   variables: