Make internal unique scene resource ID deterministic

Changes the Resource::generate_scene_unique_id() to be deterministic and
seedable.

Fixes #97110

core/io/resource_format_binary.cpp

@@ -2136,6 +2136,8 @@ static String _resource_get_class(Ref<Resource> p_resource) {
 }
 
 Error ResourceFormatSaverBinaryInstance::save(const String &p_path, const Ref<Resource> &p_resource, uint32_t p_flags) {
+	Resource::seed_scene_unique_id(p_path.hash());
+
 	Error err;
 	Ref<FileAccess> f;
 	if (p_flags & ResourceSaver::FLAG_COMPRESS) {