fix(typecheck): fix error test case mapping for @ts-expect-error

[hi-ogawa]

Description

• Cherry-picked a fix from test: skip vue v8 coverage test on Vite 6 #7124

The bugs is reproducible on Vite 5 as well, so I extracted the fix in a separate PR.

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[hi-ogawa]

The existing fallback logic breaks by simply adding spaces here.