feat: ignore *.{test,spec}.{js,ts} and similar files

[rChaoz]

Closes #13008, please see issue for more details

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[Rich-Harris]

preview: https://svelte-dev-git-preview-kit-13009-svelte.vercel.app/

this is an automated message

[dummdidumm]

I don't think we need extra config for this - which could also be abused to hide files from the router which it should otherwise not (like a backdoor to customize your routing scheme in weird ways). .test/.spec.{js.ts} will suffice

[rChaoz]

I don't agree with that. First, because you may have different/multiple extensions, or a combination. It's not rare to see:

• x.test.svelte.js / x.svelte.test.js
• other extensions like .stories, for example used with +page.stories.svelte
• separation between unit/int tests, for example x.test.js and x.int.test.js

Also, I don't think something shouldn't be added just because there is a chance it can be misused.