scripted-diff: Rename MainSignals to ValidationSignals

-BEGIN VERIFY SCRIPT-
s() { git grep -l "$1" src | xargs sed -i "s/$1/$2/g"; }

s 'CMainSignals'    'ValidationSignals'
s 'MainSignalsImpl' 'ValidationSignalsImpl'
-END VERIFY SCRIPT-

src/test/util/setup_common.cpp

@@ -171,7 +171,7 @@ ChainTestingSetup::ChainTestingSetup(const ChainType chainType, const std::vecto
     // from blocking due to queue overrun.
     m_node.scheduler = std::make_unique<CScheduler>();
     m_node.scheduler->m_service_thread = std::thread(util::TraceThread, "scheduler", [&] { m_node.scheduler->serviceQueue(); });
-    m_node.validation_signals = std::make_unique<CMainSignals>(*m_node.scheduler);
+    m_node.validation_signals = std::make_unique<ValidationSignals>(*m_node.scheduler);
 
     m_node.fee_estimator = std::make_unique<CBlockPolicyEstimator>(FeeestPath(*m_node.args), DEFAULT_ACCEPT_STALE_FEE_ESTIMATES);
     m_node.mempool = std::make_unique<CTxMemPool>(MemPoolOptionsForTest(m_node));

src/test/validationinterface_tests.cpp

@@ -52,7 +52,7 @@ BOOST_AUTO_TEST_CASE(unregister_validation_interface_race)
 class TestInterface : public CValidationInterface
 {
 public:
-    TestInterface(CMainSignals& signals, std::function<void()> on_call = nullptr, std::function<void()> on_destroy = nullptr)
+    TestInterface(ValidationSignals& signals, std::function<void()> on_call = nullptr, std::function<void()> on_destroy = nullptr)
         : m_on_call(std::move(on_call)), m_on_destroy(std::move(on_destroy)), m_signals{signals}
     {
     }
@@ -72,7 +72,7 @@ public:
     }
     std::function<void()> m_on_call;
     std::function<void()> m_on_destroy;
-    CMainSignals& m_signals;
+    ValidationSignals& m_signals;
 };
 
 // Regression test to ensure UnregisterAllValidationInterfaces calls don't