Support `deno.json` and `package.json` without a `name` field

Describe the bug

I would love to use vanilla-extract in a Deno environment however currently the getPackageInfo function cannot find a package.json with a name field.

While Deno has compatibility for package.json it would be nice to not have to rely on it.

Reproduction

https://github.com/emonadeo/repro_vanilla-extract_1563

System Info

N/A

Used Package Manager

pnpm

Logs

Couldn't find parent package.json with a name field from '/<redacted>'
  Location:
    /<redacted>/node_modules/.deno/@[email protected]/node_modules/@vanilla-extract/integration/dist/vanilla-extract-integration.cjs.dev.js:351:11

Validations

• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• The provided reproduction is a minimal reproducible example of the bug.