1. Extracted texture paths in `GLTFDocument::_parse_image_save_image` at the project root started with res:/// which broke cache invalidation
2. md5 hashes were not being written to generator_parameters for new imports, which led Godot to think the file was manually created.
3. `EditorFileSystem::reimport_append` must emit the `resources_reimported` signal in order for the resource cache to be updated.
(cherry picked from commit fea4165ca8)
80bf0cff65