Fix codespace test so it can run under codespaces.

tests/Aspire.Hosting.Tests/Codespaces/CodespacesUrlRewriterTests.cs

@@ -15,6 +15,10 @@ public class CodespacesUrlRewriterTests(ITestOutputHelper testOutputHelper)
     public async Task VerifyUrlsRewriterStopsWhenNotInCodespaces()
     {
         using var builder = TestDistributedApplicationBuilder.Create(testOutputHelper);
+
+        // Explicitly disable codespace behavior for this test.
+        builder.Configuration["CODESPACES"] = "false";
+
         builder.Services.AddLogging(logging =>
         {
             logging.AddFakeLogging();