fix: don't collapse whitespace within text nodes

[dummdidumm]

fixes #9892 - whitespace at the edges of text is trimmed as before, but whitespace within text nodes is kept as-is under the assumption that someone has put the whitespace there on purpose.

We still need to decide whether or not we actually want to do this (I'm in favor) - this PR shows that it's possible to do without adjustments anywhere else in the compiler (no difference in walking nodes etc)

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[Rich-Harris]

seems reasonable