consensus: reduce size of test fixtures and logging rate (#8172)

We can reduce the size of test fixtures (which will improve test
reliability) without impacting these tests' primary role (which is
correctness.)

Also reducing these test logging will make the tests easier to read,
which whill be a good quality of life improvement for devs.

internal/consensus/reactor_test.go

@@ -355,7 +355,7 @@ func TestReactorBasic(t *testing.T) {
 
 	cfg := configSetup(t)
 
-	n := 4
+	n := 2
 	states, cleanup := makeConsensusState(ctx, t,
 		cfg, n, "consensus_reactor_test",
 		newMockTickerFunc(true))
@@ -445,7 +445,7 @@ func TestReactorWithEvidence(t *testing.T) {
 
 	cfg := configSetup(t)
 
-	n := 4
+	n := 2
 	testName := "consensus_reactor_test"
 	tickerFunc := newMockTickerFunc(true)
 
@@ -551,7 +551,7 @@ func TestReactorCreatesBlockWhenEmptyBlocksFalse(t *testing.T) {
 
 	cfg := configSetup(t)
 
-	n := 4
+	n := 2
 	states, cleanup := makeConsensusState(ctx,
 		t,
 		cfg,
@@ -574,7 +574,7 @@ func TestReactorCreatesBlockWhenEmptyBlocksFalse(t *testing.T) {
 	// send a tx
 	require.NoError(
 		t,
-		assertMempool(t, states[3].txNotifier).CheckTx(
+		assertMempool(t, states[1].txNotifier).CheckTx(
 			ctx,
 			[]byte{1, 2, 3},
 			nil,
@@ -605,7 +605,7 @@ func TestReactorRecordsVotesAndBlockParts(t *testing.T) {
 
 	cfg := configSetup(t)
 
-	n := 4
+	n := 2
 	states, cleanup := makeConsensusState(ctx, t,
 		cfg, n, "consensus_reactor_test",
 		newMockTickerFunc(true))
@@ -670,7 +670,7 @@ func TestReactorVotingPowerChange(t *testing.T) {
 
 	cfg := configSetup(t)
 
-	n := 4
+	n := 2
 	states, cleanup := makeConsensusState(ctx,
 		t,
 		cfg,