net/http: skip flaky TestTransportMaxConnsPerHost for now

Updates #31784

Change-Id: Iee056c850c03939606b227a12715c76b0339d268
Reviewed-on: https://go-review.googlesource.com/c/go/+/175097
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/net/http/transport_test.go

@@ -21,6 +21,7 @@ import (
 	"errors"
 	"fmt"
 	"internal/nettrace"
+	"internal/testenv"
 	"io"
 	"io/ioutil"
 	"log"
@@ -590,9 +591,7 @@ func TestTransportMaxConnsPerHostIncludeDialInProgress(t *testing.T) {
 
 func TestTransportMaxConnsPerHost(t *testing.T) {
 	defer afterTest(t)
-	if runtime.GOOS == "js" {
-		t.Skipf("skipping test on js/wasm")
-	}
+	testenv.SkipFlaky(t, 31784)
 	h := HandlerFunc(func(w ResponseWriter, r *Request) {
 		_, err := w.Write([]byte("foo"))
 		if err != nil {