Bump .NET SDK again

- remove Microsoft.NET.Test.Sdk version override
- new vstest.console.dll in the .NET SDK is again compatible w/ older testhost.dll in the Test SDK

Author: dougbu

eng/Versions.props

@@ -184,11 +184,6 @@
     <MicrosoftBuildUtilitiesCoreVersion>16.9.0</MicrosoftBuildUtilitiesCoreVersion>
     <MicrosoftBuildLocatorVersion>1.2.6</MicrosoftBuildLocatorVersion>
     <MicrosoftBuildUtilitiesCoreVersion>16.9.0</MicrosoftBuildUtilitiesCoreVersion>
-    <!--
-      Temporarily override the Microsoft.NET.Test.Sdk version Arcade defaults to. That's incompatible w/ test
-      framework in current .NET SDKs.
-    -->
-    <MicrosoftNETTestSdkVersion>17.1.0-preview-20211109-03</MicrosoftNETTestSdkVersion>
     <!--
       Versions of Microsoft.CodeAnalysis packages referenced by analyzers shipped in the SDK.
       This need to be pinned since they're used in 3.1 apps and need to be loadable in VS 2019.

global.json

@@ -1,9 +1,9 @@
 {
   "sdk": {
-    "version": "7.0.100-alpha.1.21558.2"
+    "version": "7.0.100-alpha.1.21574.8"
   },
   "tools": {
-    "dotnet": "7.0.100-alpha.1.21558.2",
+    "dotnet": "7.0.100-alpha.1.21574.8",
     "runtimes": {
       "dotnet/x64": [
         "2.1.30",