test: HeaderHash test vector (#6531)

## Decription

Tag teaming with callum on debugging, wrote this to test headerHash changes from 0.34 to master. Its useful going forward as well.

types/block_test.go

@@ -1312,3 +1312,37 @@ func TestCommit_ValidateBasic(t *testing.T) {
 		})
 	}
 }
+
+func TestHeaderHashVector(t *testing.T) {
+	chainID := "test"
+	h := Header{
+		Version:            version.Consensus{Block: 1, App: 1},
+		ChainID:            chainID,
+		Height:             50,
+		Time:               time.Date(math.MaxInt64, 0, 0, 0, 0, 0, math.MaxInt64, time.UTC),
+		LastBlockID:        BlockID{},
+		LastCommitHash:     []byte("f2564c78071e26643ae9b3e2a19fa0dc10d4d9e873aa0be808660123f11a1e78"),
+		DataHash:           []byte("f2564c78071e26643ae9b3e2a19fa0dc10d4d9e873aa0be808660123f11a1e78"),
+		ValidatorsHash:     []byte("f2564c78071e26643ae9b3e2a19fa0dc10d4d9e873aa0be808660123f11a1e78"),
+		NextValidatorsHash: []byte("f2564c78071e26643ae9b3e2a19fa0dc10d4d9e873aa0be808660123f11a1e78"),
+		ConsensusHash:      []byte("f2564c78071e26643ae9b3e2a19fa0dc10d4d9e873aa0be808660123f11a1e78"),
+		AppHash:            []byte("f2564c78071e26643ae9b3e2a19fa0dc10d4d9e873aa0be808660123f11a1e78"),
+
+		LastResultsHash: []byte("f2564c78071e26643ae9b3e2a19fa0dc10d4d9e873aa0be808660123f11a1e78"),
+
+		EvidenceHash:    []byte("f2564c78071e26643ae9b3e2a19fa0dc10d4d9e873aa0be808660123f11a1e78"),
+		ProposerAddress: []byte("2915b7b15f979e48ebc61774bb1d86ba3136b7eb"),
+	}
+
+	testCases := []struct {
+		header   Header
+		expBytes string
+	}{
+		{header: h, expBytes: "87b6117ac7f827d656f178a3d6d30b24b205db2b6a3a053bae8baf4618570bfc"},
+	}
+
+	for _, tc := range testCases {
+		hash := tc.header.Hash()
+		require.Equal(t, tc.expBytes, hex.EncodeToString(hash))
+	}
+}