Add unit tests for signals generated by ProcessNewBlock()

After a recent bug discovered in callback ordering in MainSignals,
this test checks invariants in ordering of
BlockConnected / BlockDisconnected / UpdatedChainTip signals

src/Makefile.test.include

@@ -85,9 +85,10 @@ BITCOIN_TESTS =\
   test/transaction_tests.cpp \
   test/txvalidation_tests.cpp \
   test/txvalidationcache_tests.cpp \
-  test/versionbits_tests.cpp \
   test/uint256_tests.cpp \
-  test/util_tests.cpp
+  test/util_tests.cpp \
+  test/validation_block_tests.cpp \
+  test/versionbits_tests.cpp
 
 if ENABLE_WALLET
 BITCOIN_TESTS += \