storage: deflake TestStoreRangeRemoveDead

This took me longer to track down than I'm comfortable admitting. The
test wasn't properly checking for full upreplication because it was only
looking at the first range. It still is, but that's now all the ranges
-- it's finicky to upgrade the check.

Fixes #33497.
Closes #33486.

Release note: None

pkg/storage/client_raft_test.go

@@ -3012,7 +3012,12 @@ func TestStoreRangeRemoveDead(t *testing.T) {
 	defer leaktest.AfterTest(t)()
 	sc := storage.TestStoreConfig(nil)
 	sc.TestingKnobs.DisableReplicaRebalancing = true
-	mtc := &multiTestContext{storeConfig: &sc}
+	mtc := &multiTestContext{
+		storeConfig: &sc,
+		// This test needs to verify full replication, but as written the check
+		// only works if there's only one range initially.
+		startWithSingleRange: true,
+	}
 
 	storage.TimeUntilStoreDead.Override(&sc.Settings.SV, storage.TestTimeUntilStoreDead)
 	// Disable declined and failed reservations. Their default values are on
@@ -3066,13 +3071,26 @@ func TestStoreRangeRemoveDead(t *testing.T) {
 						panic(err)
 					}
 				}
+
+			case <-stopper.ShouldQuiesce():
+				return
+			}
+		}
+	})
+	stopper.RunWorker(ctx, func(ctx context.Context) {
+		tickerDur := storage.TestTimeUntilStoreDead / 2
+		ticker := time.NewTicker(tickerDur)
+		defer ticker.Stop()
+
+		for {
+			select {
+			case <-ticker.C:
 				// Force the repair queues on all alive stores to run.
 				for _, s := range nonDeadStores {
 					if err := s.ForceReplicationScanAndProcess(); err != nil {
 						panic(err)
 					}
 				}
-
 			case <-stopper.ShouldQuiesce():
 				return
 			}
@@ -3081,6 +3099,8 @@ func TestStoreRangeRemoveDead(t *testing.T) {
 
 	// Wait for up-replication, including at least one replica on s2 (deadStore).
 	testutils.SucceedsSoon(t, func() error {
+		// NB: this only checks the first range, so it'll give false positives
+		// if there's more than one (see the note at the beginning of the test).
 		replicas := getRangeMetadata(roachpb.RKeyMin, mtc, t).Replicas
 		var found bool
 		for _, replica := range replicas {