Compiler doesn't generate $Parameters file when using the @preloadable directive

In OSS it appears compiler the doesn't generate a `$Parameters` file when you use the `@preloadable` directive — which is expected according to [loadQuery's documentation](https://github.com/facebook/relay/blob/6e4ff95b9e1d53254a0d01a97ab02a53643c0bb4/website/docs/api-reference/hooks/load-query.md?plain=1#L56) and the [glossary](https://github.com/facebook/relay/blob/6e4ff95b9e1d53254a0d01a97ab02a53643c0bb4/website/docs/glossary/glossary.md?plain=1#L606).