Remove the abci responses type - prune legacy responses (#8673)

Closes #8069 

* Type `ABCIResponses` was just wrapping type `ResponseFinalizeBlock`. This patch removes the former.
* Did some renaming to avoid confusion on the data structure we are working with.
* We also remove any stale ABCIResponses we may have in the state store at the time of pruning

**IMPORTANT**: There is an undesirable side-effect of the unwrapping. An empty `ResponseFinalizeBlock` yields a 0-length proto-buf serialized buffer. This was not the case with `ABCIResponses`. I have added an interim solution, but open for suggestions on more elegant ones.

internal/inspect/inspect_test.go

@@ -23,7 +23,6 @@ import (
 	indexermocks "github.com/tendermint/tendermint/internal/state/indexer/mocks"
 	statemocks "github.com/tendermint/tendermint/internal/state/mocks"
 	"github.com/tendermint/tendermint/libs/log"
-	"github.com/tendermint/tendermint/proto/tendermint/state"
 	httpclient "github.com/tendermint/tendermint/rpc/client/http"
 	"github.com/tendermint/tendermint/types"
 )
@@ -263,12 +262,10 @@ func TestBlockResults(t *testing.T) {
 	testGasUsed := int64(100)
 	stateStoreMock := &statemocks.Store{}
 	//	tmstate "github.com/tendermint/tendermint/proto/tendermint/state"
-	stateStoreMock.On("LoadABCIResponses", testHeight).Return(&state.ABCIResponses{
-		FinalizeBlock: &abcitypes.ResponseFinalizeBlock{
-			TxResults: []*abcitypes.ExecTxResult{
-				{
-					GasUsed: testGasUsed,
-				},
+	stateStoreMock.On("LoadFinalizeBlockResponses", testHeight).Return(&abcitypes.ResponseFinalizeBlock{
+		TxResults: []*abcitypes.ExecTxResult{
+			{
+				GasUsed: testGasUsed,
 			},
 		},
 	}, nil)