chore: use build.mode wherever possible

[MichaelDeBoey]

Follo-up of @pcattori's #6964

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Latest commit: a138c5f

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[aaronadamsCA]

@MichaelDeBoey, do you think this line would be safe to change as well? I'm assuming it was just overlooked at the time, but I was hoping to make sure.

remix/templates/cloudflare-pages/server.ts

Line 5 in 94695c3

if (process.env.NODE_ENV === "development") {