React router fixes and production server fixes

[AlexanderKaran]

• Ensure each frameworks uses its official production server
• Also made sure the CSR harness returns 404 for missing assets
• Updated React Router to use ClientLoader instead, which makes the SPA build not needed
• Type check for React Router
• As TanStack is now the only app using a SPA build, set it up to be like others and left a comment in methodology. Still renderes client side though

Sorry the large PR had to merge to due to a few server bugs that cropped up in the CI run

Few more edits:

• Set production server to production
• Moved handlers for throughput test into their own things so it clearer. I know we might remove this one but makes it easier if we do too
• Temp removed Mastro from SSR tests will fix up in its own PR

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