fix: replace wildcard exports "./*" with specific files in vitest package

[hi-ogawa]

Description

The top level ./* includes all the build output vitest/dist/.... Limiting this should prevent IDE completion from picking up cryptic names directly from those files, for example:

import { V } from 'vitest/dist/chunks/reporters.d.BFLkQcL6.js';

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commit: 892e6ba

[AriPerkkio]

Tested the preview build and it seems to fix this!

Usually changes in exports are a breaking change but this is a clear bug fix instead.