Use TemporaryFolderExtension for flaky domain socket test (#4969)

Motivation:

I'm seeing the following CI failure often: https://github.com/line/armeria/actions/runs/5310769708/jobs/9613156056?pr=4968#step:7:1791
This is most likely since netty removes the directory, and then junit also tries to remove the directory and fails with a `NoSuchFileException`.

Modifications:

- Use the internal `TemporaryFolderExtension` for testing unix domain sockets. Note that the file is created directly under root since domain sockets have a max path length of approximately 110.

Result:

- More stable CIs

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core/src/test/java/com/linecorp/armeria/server/DomainSocketServerTest.java

@@ -18,21 +18,20 @@
 import static org.assertj.core.api.Assertions.assertThat;
 
 import java.nio.charset.StandardCharsets;
-import java.nio.file.Path;
 import java.util.concurrent.BlockingQueue;
 import java.util.concurrent.LinkedTransferQueue;
 import java.util.stream.Collectors;
 
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.RegisterExtension;
-import org.junit.jupiter.api.io.TempDir;
 
 import com.linecorp.armeria.common.CommonPools;
 import com.linecorp.armeria.common.Flags;
 import com.linecorp.armeria.common.HttpResponse;
 import com.linecorp.armeria.common.util.DomainSocketAddress;
 import com.linecorp.armeria.common.util.TransportType;
 import com.linecorp.armeria.internal.testing.EnabledOnOsWithDomainSockets;
+import com.linecorp.armeria.internal.testing.TemporaryFolderExtension;
 import com.linecorp.armeria.testing.junit5.server.ServerExtension;
 
 import io.netty.bootstrap.Bootstrap;
@@ -45,8 +44,8 @@
 @EnabledOnOsWithDomainSockets
 class DomainSocketServerTest {
 
-    @TempDir
-    static Path tempDir;
+    @RegisterExtension
+    static final TemporaryFolderExtension tempDir = new TemporaryFolderExtension();
 
     @RegisterExtension
     static final ServerExtension server = new ServerExtension() {
@@ -100,6 +99,6 @@ public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception
     }
 
     private static DomainSocketAddress domainSocketAddress() {
-        return DomainSocketAddress.of(tempDir.resolve("test.sock"));
+        return DomainSocketAddress.of(tempDir.getRoot().resolve("test.sock"));
     }
 }