fix(sveltekit): Load environment variables from process.env

[blaine-arcjet]

I can't find the actual part of the SvelteKit code that causes the import of "$env/dynamic/private" inside a node_module to fail, but I fixed our example so the problem surfaced.

I also discovered https://github.com/sveltejs/kit/issues/12028 which states that a warning should be added that third-party libraries should not use this import. And https://github.com/nextauthjs/next-auth/issues/9809 + https://github.com/nextauthjs/next-auth/pull/10117 which highlight problems when it is used.

Perhaps we'll need to explore something like https://github.com/nextauthjs/next-auth/discussions/6247 but it seems that process.env is populated in SvelteKit so we can use it for now.

Fixes #982

[trunk-io[bot]]

😎 Merged successfully - details.

[socket-security[bot]]

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🚮 Removed packages: npm/@sveltejs/adapter-node@5.1.0

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[blaine-arcjet]

Also tested with bun run dev and it works since Bun supports process.env