Add prerender SPA mode bug report test

[namoscato]

The Single Page App (SPA) guide notes pre-rendering can be configured, but a build-time error is always thrown when a route loader is defined in SPA mode (ssr: false):

[react-router:route-exports] SPA Mode: 1 invalid route export(s) in `routes/home.tsx`: `loader`. See https://remix.run/guides/spa-mode for more information.

Am I misunderstanding SPA pre-rendering?

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[amydevs]

IMO i would like for loaders to be allowed for when prerendering + spa are both enabled for a similar purpose as next.js' getStaticProps. However, I believe loaders are currently intentionally disabled in SPA mode entirely, as SPA mode without prerendering does not allow for SSG features.