feat(erv2): contributes to ER-162

[joelhooks]

adds a cookie on sign in to indicate active session across subdomains

fixes ER-184

https://www.loom.com/share/f7ce051a50214956abb3bfd553cc8d4a?sid=a16c85ff-fa62-420e-8e20-7431fe59e49e

[linear[bot]]

ER-162 Create required cookies and endpoints for disabling features in workshop app

[vercel[bot]]

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[linear[bot]]

ER-184 500 response for unauthenticated API requests instead of 401