update env_wildcards for SvelteKit (#8685)
### Description
Updates the environment variables prefix for SvelteKit framework
inference to match SvelteKit documentation:
https://learn.svelte.dev/tutorial/env-static-public
Closes #8684
### Testing Instructions
See #8684 for issue reproduction.
Co-authored-by: Anthony Shew <anthony.shew@vercel.com>
