Exclude files with vite plugin

[atomicpages]

Related to #15943 and this discussion here: #16712

The ability to exclude certain files with the vite plugin would be great for apps incrementally migrating from a different CSS solution (e.g. vanilla-extract or any CSS-in-JS solution that uses .css.ts|js file names) to tailwind v4 using vite. I have a PR ready that adds a simple option to the tailwind config ready if there's interest in allowing this.

[RobinMalfait]

Hey!

Going to close this as a duplicate of #15943 so it's easier for us to track all the issues 👍