tests: add retries to TestCatchpointTrackerWaitNotBlocking (#6472)

Author: algorandskiy

ledger/catchpointtracker_test.go

@@ -1092,16 +1092,19 @@ func TestCatchpointTrackerWaitNotBlocking(t *testing.T) {
 	}
 
 	// switch context one more time to give the blockqueue syncer to run
-	time.Sleep(1 * time.Millisecond)
+	time.Sleep(10 * time.Millisecond)
 
 	// ensure Ledger.Wait() is non-blocked for all rounds except the last one (due to possible races)
 	for rnd := startRound; rnd < endRound; rnd++ {
 		done := ledger.Wait(rnd)
-		select {
-		case <-done:
-		default:
-			require.FailNow(t, fmt.Sprintf("Wait(%d) is blocked", rnd))
-		}
+		require.Eventually(t, func() bool {
+			select {
+			case <-done:
+				return true
+			default:
+				return false
+			}
+		}, 15*time.Millisecond, 1*time.Millisecond, "Wait(%d) is blocked", rnd)
 	}
 }