fix(vite-node): add __vite_ssr_exportName__

[hi-ogawa]

Description

Testing vitejs/vite#19996 on Vitest. I mainly wonder if this extra function indirection can affect coverage or something.

CI is passing both on current Vite e3c3f16 and new Vite 1621e2a

I think we can release this before Vite's breaking change since it's not much of a breaking change by adding this on vite-node side.

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commit: e0bb432