Revert "Try to make global.json to use .NET 8"

This reverts commit c3dd3d3.

Author: bouwkast

tracer/test/Datadog.Trace.ClrProfiler.IntegrationTests/InstrumentationTests.cs

@@ -82,7 +82,7 @@ public async Task DoesNotInstrumentDotnetBuild()
 
             using var agent = EnvironmentHelper.GetMockAgent(useTelemetry: true);
 
-            var logDir = await RunDotnet("new console -n instrumentation_test -o . --no-restore");
+            var logDir = await RunDotnet("new console -n instrumentation_test -o . --no-restore -f net8.0");
             AssertNotInstrumented(agent, logDir);
 
             logDir = await RunDotnet("restore");
@@ -110,14 +110,11 @@ public async Task DoesNotInstrumentExcludedNames(string excludedProcess)
             var workingDir = Path.Combine(Path.GetTempPath(), Path.GetFileNameWithoutExtension(Path.GetRandomFileName()));
             Directory.CreateDirectory(workingDir);
 
-            // Hack to ensure that the .NET 8.0 SDK is used instead of .NET 10 as it complains about not finding the runtime
-            EnsureNet8Sdk(workingDir);
-
             Output.WriteLine("Using workingDirectory: " + workingDir);
 
             using var agent = EnvironmentHelper.GetMockAgent(useTelemetry: true);
 
-            var logDir = await RunDotnet($"new console -n {excludedProcess} -o . --no-restore");
+            var logDir = await RunDotnet($"new console -n {excludedProcess} -o . --no-restore -f net8.0");
             AssertNotInstrumented(agent, logDir);
 
             var programCs = GetProgramCSThatMakesSpans();
@@ -151,14 +148,11 @@ public async Task DoesInstrumentAllowedProcesses(string allowedProcess)
             var workingDir = Path.Combine(Path.GetTempPath(), Path.GetFileNameWithoutExtension(Path.GetRandomFileName()));
             Directory.CreateDirectory(workingDir);
 
-            // Hack to ensure that the .NET 8.0 SDK is used instead of .NET 10 as it complains about not finding the runtime
-            EnsureNet8Sdk(workingDir);
-
             Output.WriteLine("Using workingDirectory: " + workingDir);
 
             using var agent = EnvironmentHelper.GetMockAgent(useTelemetry: true);
 
-            var logDir = await RunDotnet($"new console -n {allowedProcess} -o . --no-restore");
+            var logDir = await RunDotnet($"new console -n {allowedProcess} -o . --no-restore -f net8.0");
             AssertNotInstrumented(agent, logDir);
             var programCs = GetProgramCSThatMakesSpans();
 
@@ -188,14 +182,11 @@ public async Task InstrumentsDotNetTest()
             var workingDir = Path.Combine(Path.GetTempPath(), Path.GetFileNameWithoutExtension(Path.GetRandomFileName()));
             Directory.CreateDirectory(workingDir);
 
-            // Hack to ensure that the .NET 8.0 SDK is used instead of .NET 10 as it complains about not finding the runtime
-            EnsureNet8Sdk(workingDir);
-
             Output.WriteLine("Using workingDirectory: " + workingDir);
 
             using var agent = EnvironmentHelper.GetMockAgent(useTelemetry: true);
 
-            var logDir = await RunDotnet("new xunit -n instrumentation_test -o . --no-restore");
+            var logDir = await RunDotnet("new xunit -n instrumentation_test -o . --no-restore -f net8.0");
             AssertNotInstrumented(agent, logDir);
 
             // this _should_ be instrumented so we expect managed data.
@@ -849,17 +840,6 @@ private void AddFilesAsReportable(string logDir, AssertionScope scope, string[]
                 });
         }
 
-        private void EnsureNet8Sdk(string workingDirectory)
-        {
-            var globalJson = @"{
-  ""sdk"": {
-    ""version"": ""8.0.0"",
-    ""rollForward"": ""latestMinor""
-  }
-}";
-            File.WriteAllText(Path.Combine(workingDirectory, "global.json"), globalJson);
-        }
-
         private bool IsAllLoggingDisabledForBailout()
         {
             var isSsi = EnvironmentHelper.CustomEnvironmentVariables.TryGetValue("DD_INJECTION_ENABLED", out var injectionEnabled)