Do not pass data: fetch requests to the native http request handler

[frederikbosch]

For all sorts of reasons, a fetch request of data URI might be executed.

fetch(new URL('data:text/css,body{background:red}'))

At the moment these requests are forwarded to the native request, causing crashes like the one that PR #8304 is trying to solve. With this PR, data: requests will not be forwarded anymore to native request layer.

Just to explain why, in my app, I am fetching a DATA CSS Uri.

• in my app the following code fetch(new URL('./file.css'))
• is compiled by Vite as fetch(new URL('data:text/css,body{background:red}'))
• so, while I am not intentionally fetching a data URI, it is compiled as such, because the resource is so small that Vite modifies it to an inline asset