test: skip some IBM i unsupported test cases

Issuing a shutdown() on IBM i PASE with parameter SHUT_WR
also sends a normal close sequence to the partner program.
This leads to timing issues and ECONNRESET failures in some
test cases.
Refs: libuv/libuv#2782

PR-URL: #34118
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Beth Griggs <Bethany.Griggs@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/parallel/parallel.status

@@ -65,3 +65,13 @@ test-cluster-shared-leak: SKIP
 test-http-writable-true-after-close: SKIP
 test-http2-connect-method: SKIP
 test-net-error-twice: SKIP
+# https://github.com/libuv/libuv/pull/2782
+test-net-allow-half-open: SKIP
+test-net-keepalive: SKIP
+test-net-persistent-keepalive: SKIP
+test-net-socket-close-after-end: SKIP
+test-net-socket-connect-without-cb: SKIP
+test-net-socket-connecting: SKIP
+test-net-socket-ready-without-cb: SKIP
+test-net-write-after-end-nt: SKIP
+test-tls-env-extra-ca: SKIP