Promote object validity checks to release builds

Extra:
- Optimized the debug-only check about why the object is null to determine if it's because it has been deleted (the RC is enough; no need to check the ObjectDB).
- Because of the previous point. the debugger being attached is not required anymore for giving the "Object was deleted" error; from now, it only matters that it's a debug build.
- `is_instance_valid()` is now trustworthy. It will return `true` if, and only if, the last object assigned to a `Variant` is still alive (and not if a new object happened to be created at the same memory address of the old one).
- Replacements of `instance_validate()` are used where possible `Variant::is_invalid_object()` is introduced to help with that. (GDScript's `is_instance_valid()` is good.)

modules/gdscript/gdscript_functions.cpp

@@ -1382,7 +1382,7 @@ void GDScriptFunctions::call(Function p_func, const Variant **p_args, int p_arg_
 				r_ret = false;
 			} else {
 				Object *obj = *p_args[0];
-				r_ret = ObjectDB::instance_validate(obj);
+				r_ret = obj != nullptr;
 			}
 
 		} break;