test: update pipeline expectation for framed client requests

A client request that writes a payload is now framed with a chunked
Transfer-Encoding. When the body source is destroyed before EOF the
request ends without its terminating chunk, so the peer resets the
connection instead of seeing a clean close, and the echoed response
fails with ECONNRESET rather than ERR_STREAM_PREMATURE_CLOSE.

Signed-off-by: Avocado <ujubongbong@gmail.com>

Author: zeexzeex

test/parallel/test-stream-pipeline.js

@@ -271,9 +271,10 @@ tmpdir.refresh();
 {
   const server = http.createServer(common.mustCallAtLeast((req, res) => {
     pipeline(req, res, common.mustCall((err) => {
-      // The client destroys the request body source before EOF below, so the
-      // echoed response cannot finish successfully either.
-      assert.strictEqual(err?.code, 'ERR_STREAM_PREMATURE_CLOSE');
+      // The client destroys the request body source before EOF below. The
+      // request is framed as chunked, so it ends without its terminating
+      // chunk and the connection is reset rather than closed cleanly.
+      assert.strictEqual(err?.code, 'ECONNRESET');
     }));
   }));