svelte5 - custom attributes like `src` must be removed from tag when preprocessing them

[dominikg]

Describe the bug
A recent change in svelte5 made attributes on <script> protected. Proprocessors using custom attributes must remove them to avoid warnings

/home/dominikg/develop/sveltejs/vite-plugin-svelte/packages/e2e-tests/svelte-preprocess/src/lib/multifile/MultiFile.svelte
  2:19  error  Unrecognized attribute — should be one of `generics`, `lang` or `module`. If this exists for a preprocessor, ensure that the preprocessor removes it(script_unknown_attribute)  svelte/valid-compile

https://github.com/sveltejs/vite-plugin-svelte/pull/960/files#diff-22639710c6daf7afe79020aa0bd65ee0147141762bf41af679f23042a2a4128b

Logs
Please include browser console and server logs around the time this bug occurred.

To Reproduce
clone vite-plugin-svelte repo
remove disable comment: https://github.com/sveltejs/vite-plugin-svelte/blob/12b7af76dac68b4cf3b60bba269aa927a2528716/packages/e2e-tests/svelte-preprocess/src/lib/multifile/MultiFile.svelte#L2

run pnpm lint

Expected behavior
no warning

Information about your project:

latest vite, svelte5-next and svelte-preprocess

Additional context
eslint-plugin-svelte currently makes an error out of this warning, which might be too harsh