Reduce misc includes all around

src/catch2/internal/catch_assertion_handler.cpp

@@ -12,7 +12,6 @@
 #include <catch2/internal/catch_debugger.hpp>
 #include <catch2/internal/catch_test_failure_exception.hpp>
 #include <catch2/interfaces/catch_interfaces_registry_hub.hpp>
-#include <catch2/internal/catch_run_context.hpp>
 #include <catch2/matchers/catch_matchers_string.hpp>
 
 namespace Catch {