test(utils): support turbopack-based overlay error text lookup (#46589
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- closes WEB-672.
Due to differences of error overlay layout between turbopack and normal
next-dev, test fixtures cannot lookup corresponding error text with same
data-* tag. Companion PR https://github.com/vercel/turbo/pull/4015 added
new tag for the turbopack specific, and this PR utilizes those if test
runs against --turbo.
## Bug
- [x] Related issues linked using `fixes #number`