chore: fix prettier ignoring source code in with build in the name

[teemingc]

This PR changes the kit prettierignore and repo prettier config to correctly include the files in packages/kit/src/exports/vite/build. It was being ignored because we tried to configure prettier to ignore build folders produced by svelte kit test app builds.

This whole time I thought it was an issue with prettier or my local setup. Only found out about this when I read the prettier extension output logs in detail

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[elliott-with-the-longest-name-on-github]

What the heck is up with this? Why aren't these files just ignored if we're formatting 0% of them?

[benmccann]

Seems like maybe it's some kind of a performance hack? (#13058) Perhaps @dominikg knows more

[dominikg]

rangeEnd 0 makes prettier read the first 0 bytes, so not read the file at all.

this is a way to define ignores in prettier config rather than a separate .prettierignore

[elliott-with-the-longest-name-on-github]

Is there a way we could do this with a negative pattern? i.e. ignore **/build/** and do !packages/kit/src/exports/vite/build/build_server.js?

[benmccann]

Doing just !packages/kit/src/exports/vite/build/build_server.js seems risky because as soon as you add a second file in the directory you'd be surprised it wasn't getting formatted. I'd want to at least do !packages/kit/src/exports/vite/build