Move sanitizer to separate flag (#8999)

Author: kruall

ydb/library/actors/core/executor_pool_basic.cpp

@@ -19,14 +19,13 @@
 
 namespace NActors {
 
-#ifndef NDEBUG
+#ifdef ACTOR_SANITIZER
     constexpr bool DebugMode = true;
 #else
     constexpr bool DebugMode = false;
 #endif
 
 
-
     LWTRACE_USING(ACTORLIB_PROVIDER);