perf(turbopack): Remove indent in intermediate string (#79754)
### What?
Remove ` ` (two whitespaces) in intermediate texts.
### Why?
- In dev, browser devtools will provide formatting anyway.
- In production, we are going to parse it again and feed it to the SWC minifier regardless.
### How?
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x-ref: numbers at https://vercel.slack.com/archives/C06PPGZ0FD3/p1748380301451689
