perf: skip running plugin completely

[teemingc]

follow up to #16383

Using applyToEnvironment is better here as the plugin isn't needed in the server environment if we're already using an if (...) guard to opt out early

[pkg-svelte-dev]

Install the latest version of @sveltejs/kit from ba2413f:

pnpm add https://pkg.svelte.dev/@sveltejs/kit/c/ba2413fb09c336a760012273380e4360b70a838a

Open in pkg.svelte.dev: https://pkg.svelte.dev/repos/kit/pr/16388

[changeset-bot]

⚠️ No Changeset found

Latest commit: ba2413f

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[Rich-Harris]

nice!