Remove minified files from the package

Related to https://github.com/open-circle/valibot/issues/1467 - the minified files currently add ~180kb to the package size. Users could instead get this from a CDN, generate themselves, or if there is high demand you could publish a `@valibot/cdn` package [similar to what date-fns will be doing in v5](https://x.com/kossnocorp/status/2060505340014362638).