GLTF Loader panics when loading GLTF file

**Bevy version**

0.4

**Operating system & version**

Latest Archlinux

**What you did**

```toml
[dependencies]
bevy = { version = "0.4", features = ["dynamic", "bevy_gltf"], default-features = false }
```

And then `asset_server.load_folder(...)`.

**What you expected to happen**

~~It allows me to load gltf files without having a render backend (Since I only need the mesh in this case)~~

It simply loads the gltf file.

**What actually happened**

~~A panic with the following message: `Resource does not exist alloc::boxed::Box`~~ (A dependency was activating the `render` feature of bevy but I was not adding a backend)

It panics with an error: "thread 'IO Task Pool (1)' panicked at 'Failed to find AssetLifecycle for label Some("Mesh0/Primitive0"), which has an asset type 8ecbac0f-f545-4473-ad43-e1f4243af51e. Are you sure that is a registered asset type?',"

**Additional information**

Start by reproducing the panic with Bevy 0.4, the bevy_gltf feature, and asset_server.load_folder(...) using the configuration in the issue. Trace the GLTF loader's handling of the Mesh0/Primitive0 asset lifecycle and verify that loading the GLTF file completes without the unregistered asset-type error.

Written by the indexing model from the issue text.