test: remove duplicate test

`test/parallel/test-http-agent-no-wait.js` is basically a duplicate of
`test/parallel/test-http-client-close-with-default-agent.js`, remove it.

PR-URL: https://github.com/nodejs/node/pull/44051
Reviewed-By: Paolo Insogna <paolo@cowtech.it>
Reviewed-By: Feng Yu <F3n67u@outlook.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>

test/parallel/test-http-agent-no-wait.js

@@ -1,24 +0,0 @@
-'use strict';
-
-const common = require('../common');
-const assert = require('assert');
-const http = require('http');
-
-const server = http.createServer(function(req, res) {
-  res.writeHead(200);
-  res.end();
-});
-
-server.listen(0, common.mustCall(() => {
-  const req = http.get({ port: server.address().port }, (res) => {
-    assert.strictEqual(res.statusCode, 200);
-
-    res.resume();
-    server.close();
-  });
-
-  req.end();
-}));
-
-// This timer should never go off as the server will close the socket
-setTimeout(common.mustNotCall(), 1000).unref();

test/parallel/test-http-client-close-with-default-agent.js

@@ -20,4 +20,4 @@ server.listen(0, common.mustCall(() => {
 }));
 
 // This timer should never go off as the server will close the socket
-setTimeout(common.mustNotCall(), common.platformTimeout(10000)).unref();
+setTimeout(common.mustNotCall(), common.platformTimeout(1000)).unref();