test: add setup_validation_interface_no_scheduler to TestOpts

This option is mutually exclusive with setup_validation_interface
and ensures that a scheduler is not created.

Author: Crypt-iQ

src/test/util/setup_common.cpp

@@ -280,6 +280,8 @@ ChainTestingSetup::ChainTestingSetup(const ChainType chainType, TestOpts opts)
             m_node.scheduler->scheduleFromNow([&promise] { promise.set_value(); }, 0ms);
             promise.get_future().wait();
         }
+    } else if (opts.setup_validation_interface_no_scheduler) {
+        m_node.validation_signals = std::make_unique<ValidationSignals>(std::make_unique<util::ImmediateTaskRunner>());
     }
 
     bilingual_str error{};

src/test/util/setup_common.h

@@ -55,6 +55,7 @@ struct TestOpts {
     bool block_tree_db_in_memory{true};
     bool setup_net{true};
     bool setup_validation_interface{true};
+    bool setup_validation_interface_no_scheduler{false};
     bool min_validation_cache{false}; // Equivalent of -maxsigcachebytes=0
 };