[css-text] Rename text-space-trim?

[xfq]

We now have text-space-trim and text-spacing-trim in css-text-4. They accomplish different goals, but have similar names. It might be useful to rename one of them, e.g., change text-space-trim to white-space-trim?

[vitorroriz]

I also think that's confusing.

[frivoal]

This has been handled in #8273, and text-space-trim has indeed been changed to white-space-trim.