Downgrade msbuild sdk (#4864)

* Revert "Update global.json (#4858)"

This reverts commit bf35e8a.

* Downgrade dotnet and msbuild-sdk

* Downgrade dotnet and msbuild-sdk

* Ignore new tests, and downgrade SDK

global.json

@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "9.0.100-alpha.1.24073.1",
+    "version": "9.0.100-alpha.1.23615.4",
     "rollForward": "minor",
     "allowPrerelease": false,
     "architecture": "x64"
@@ -27,9 +27,9 @@
     "vs": {
       "version": "17.8.0"
     },
-    "xcopy-msbuild": "17.8.3",
+    "xcopy-msbuild": "17.8.1-2",
     "vswhere": "2.2.7",
-    "dotnet": "9.0.100-alpha.1.24073.1"
+    "dotnet": "9.0.100-alpha.1.23615.4"
   },
   "msbuild-sdks": {
     "Microsoft.DotNet.Arcade.Sdk": "9.0.0-beta.24076.5"

test/Microsoft.TestPlatform.Acceptance.IntegrationTests/DotnetTestMSBuildOutputTests.cs

@@ -12,6 +12,13 @@ namespace Microsoft.TestPlatform.AcceptanceTests;
 /// Running dotnet test + csproj and using MSBuild for the output.
 /// </summary>
 [TestClass]
+[Ignore(
+"""
+    Ignored because we need to update to dotnet SDK 9.0.100-alpha.1.24073.1 or newer,
+    but that depends on newer version of MSBuild sdk that is not published yet, and so our build fails in Signing validation.
+    We need that upgrade because older SDK is hardcoding the same ENV variable that we are using to disable this functionality.
+    So when we patch the targets and build dll in the current SDK this new functionality is always disabled and we cannot test it with older SDK.
+""")]
 public class DotnetTestMSBuildOutputTests : AcceptanceTestBase
 {
     [TestMethod]