De-flake setup of mem WQ restart test (#6278)

`TestNoRaceJetStreamClusterMemoryWorkQueueLastSequenceResetAfterRestart`
sometimes fails with a `nats: timeout`, but that's only in the setup
code. That setup code is made to run in parallel to have the test run a
lot faster, but it can sometimes result in timeouts on CI.

Allow for some retries in that section since it's only for setup. And if
the setup fails the asserts after will not be able to work anyway.

Signed-off-by: Maurice van Veen <github@mauricevanveen.com>

server/norace_test.go

@@ -10729,27 +10729,42 @@ func TestNoRaceJetStreamClusterMemoryWorkQueueLastSequenceResetAfterRestart(t *t
 			nc, js := jsClientConnect(t, c.randomServer())
 			defer nc.Close()
 
-			_, err := js.AddStream(&nats.StreamConfig{
-				Name:      fmt.Sprintf("TEST:%d", n),
-				Storage:   nats.MemoryStorage,
-				Retention: nats.WorkQueuePolicy,
-				Subjects:  []string{fmt.Sprintf("foo.%d.*", n)},
-				Replicas:  3,
-			}, nats.MaxWait(30*time.Second))
-			require_NoError(t, err)
+			checkFor(t, 5*time.Second, time.Second, func() error {
+				_, err := js.AddStream(&nats.StreamConfig{
+					Name:      fmt.Sprintf("TEST:%d", n),
+					Storage:   nats.MemoryStorage,
+					Retention: nats.WorkQueuePolicy,
+					Subjects:  []string{fmt.Sprintf("foo.%d.*", n)},
+					Replicas:  3,
+				}, nats.MaxWait(time.Second))
+				return err
+			})
+
 			subj := fmt.Sprintf("foo.%d.bar", n)
 			for i := 0; i < 22; i++ {
-				js.Publish(subj, nil)
+				checkFor(t, 5*time.Second, time.Second, func() error {
+					_, err := js.Publish(subj, nil)
+					return err
+				})
 			}
-			// Now consumer them all as well.
-			sub, err := js.PullSubscribe(subj, "wq")
-			require_NoError(t, err)
-			msgs, err := sub.Fetch(22, nats.MaxWait(20*time.Second))
-			require_NoError(t, err)
+			// Now consume them all as well.
+			var err error
+			var sub *nats.Subscription
+			checkFor(t, 5*time.Second, time.Second, func() error {
+				sub, err = js.PullSubscribe(subj, "wq")
+				return err
+			})
+
+			var msgs []*nats.Msg
+			checkFor(t, 5*time.Second, time.Second, func() error {
+				msgs, err = sub.Fetch(22, nats.MaxWait(time.Second))
+				return err
+			})
 			require_Equal(t, len(msgs), 22)
 			for _, m := range msgs {
-				err := m.AckSync()
-				require_NoError(t, err)
+				checkFor(t, 5*time.Second, time.Second, func() error {
+					return m.AckSync()
+				})
 			}
 		}(i)
 	}