Move DiagnosticsHandler.IsGloballyEnabled back to a method

src/libraries/System.Net.Http/src/System/Net/Http/DiagnosticsHandler.cs

@@ -31,10 +31,13 @@ internal static bool IsEnabled()
         {
             // check if there is a parent Activity (and propagation is not suppressed)
             // or if someone listens to HttpHandlerDiagnosticListener
-            return IsGloballyEnabled && (Activity.Current != null || s_diagnosticListener.IsEnabled());
+            return IsGloballyEnabled() && (Activity.Current != null || s_diagnosticListener.IsEnabled());
         }
 
-        internal static bool IsGloballyEnabled => GlobalHttpSettings.DiagnosticsHandler.EnableActivityPropagation;
+        internal static bool IsGloballyEnabled()
+        {
+            return GlobalHttpSettings.DiagnosticsHandler.EnableActivityPropagation;
+        }
 
         // SendAsyncCore returns already completed ValueTask for when async: false is passed.
         // Internally, it calls the synchronous Send method of the base class.

src/libraries/System.Net.Http/src/System/Net/Http/HttpClientHandler.cs

@@ -28,7 +28,7 @@ public partial class HttpClientHandler : HttpMessageHandler
         public HttpClientHandler()
         {
             _underlyingHandler = new HttpHandlerType();
-            if (DiagnosticsHandler.IsGloballyEnabled)
+            if (DiagnosticsHandler.IsGloballyEnabled())
             {
                 _diagnosticsHandler = new DiagnosticsHandler(_underlyingHandler);
             }