Don't emit crossorigin attributes for `output: "export"` by default (#61211)
In other output modes, link and script tags do not contain a crossorigin
attribute by default.
When using output: "export", it should also follow the other output
modes, to avoid unnecessary CORS issues, especially when hosting the
assets on a different domain (i.e. a CDN).
fixes #61210
Co-authored-by: Steven <steven@ceriously.com>