chore: generate the env modules in a single pass

[Nic-Polumeyv]

core/env.js had one generator per <sveltekit:generated>/env/* module, each iterating the same variables and calling validate() on the same static values, so a user's schema ran three to four times per build (and per hot update in dev), and a validator that isn't a pure function of its input baked different values into config.js, public/server.js and public/client.js.

create_env_modules replaces them with a single pass over the variables that returns every module keyed by path, so the plugin only writes files. Dynamic variables are untouched; they were already validated once by set_env.

One visible change: invalid variables that previously surfaced one module at a time are now reported in a single error.

[pkg-svelte-dev]

Install the latest version of @sveltejs/kit from 5f75e64:

pnpm add https://pkg.svelte.dev/@sveltejs/kit/c/5f75e6400c6089ac0c791f0a2075605c5cafae5b

Open in pkg.svelte.dev: https://pkg.svelte.dev/repos/kit/pr/16833

[changeset-bot]

🦋 Changeset detected

Latest commit: 5f75e64

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@sveltejs/kit	Patch

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[svelte-docs-bot]

Preview: https://svelte-dev-git-preview-kit-16833-svelte.vercel.app/