Update verbosity tests to reflect diagnostic-only behavior

Co-authored-by: marcpopMSFT <[email protected]>

Author: Copilot

test/dotnet.Tests/CommandTests/Workload/Install/GivenDotnetWorkloadInstall.cs

@@ -603,6 +603,7 @@ public void HideManifestUpdateCheckWhenVerbosityIsQuiet()
         [Theory(Skip = "https://github.com/dotnet/sdk/issues/25175")]
         [InlineData("--verbosity:minimal")]
         [InlineData("--verbosity:normal")]
+        [InlineData("--verbosity:detailed")]
         public void HideManifestUpdatesWhenVerbosityIsMinimalOrNormal(string verbosityFlag)
         {
             var command = new DotnetCommand(Log);
@@ -617,9 +618,8 @@ public void HideManifestUpdatesWhenVerbosityIsMinimalOrNormal(string verbosityFl
         }
 
         [Theory(Skip = "https://github.com/dotnet/sdk/issues/25175")]
-        [InlineData("--verbosity:detailed")]
         [InlineData("--verbosity:diagnostic")]
-        public void ShowManifestUpdatesWhenVerbosityIsDetailedOrDiagnostic(string verbosityFlag)
+        public void ShowManifestUpdatesWhenVerbosityIsDiagnostic(string verbosityFlag)
         {
             string sdkFeatureBand = "6.0.300";