Channelz security changes - Follow up from #25593 (#25624)

src/core/lib/channel/channelz.cc

@@ -375,7 +375,7 @@ Json SocketNode::Security::RenderJson() {
       break;
     case ModelType::kOther:
       if (other) {
-        data["other"] = tls->RenderJson();
+        data["other"] = *other;
       }
       break;
   }

test/cpp/end2end/channelz_service_test.cc

@@ -151,20 +151,17 @@ std::shared_ptr<grpc::ChannelCredentials> GetChannelCredentials(
     return InsecureChannelCredentials();
   }
   args->SetSslTargetNameOverride("foo.test.google.fr");
-  // TODO(yashykt): Switch to using C++ API once b/173823806 is fixed.
-  grpc_tls_credentials_options* options = grpc_tls_credentials_options_create();
-  grpc_tls_credentials_options_set_certificate_provider(
-      options,
-      grpc_core::MakeRefCounted<grpc_core::StaticDataCertificateProvider>(
-          ReadFile(kCaCertPath),
-          ReadTlsIdentityPair(kClientKeyPath, kClientCertPath))
-          .get());
+  std::vector<experimental::IdentityKeyCertPair> identity_key_cert_pairs = {
+      {ReadFile(kClientKeyPath), ReadFile(kClientCertPath)}};
+  grpc::experimental::TlsChannelCredentialsOptions options;
+  options.set_certificate_provider(
+      std::make_shared<grpc::experimental::StaticDataCertificateProvider>(
+          ReadFile(kCaCertPath), identity_key_cert_pairs));
   if (type == CredentialsType::kMtls) {
-    grpc_tls_credentials_options_watch_identity_key_cert_pairs(options);
+    options.watch_identity_key_cert_pairs();
   }
-  grpc_tls_credentials_options_watch_root_certs(options);
-  return std::make_shared<SecureChannelCredentials>(
-      grpc_tls_credentials_create(options));
+  options.watch_root_certs();
+  return grpc::experimental::TlsCredentials(options);
 }
 
 std::shared_ptr<grpc::ServerCredentials> GetServerCredentials(