fix: respect ssr.resolve.conditions on ssr environment

[sxzz]

Description

Respect resolve.conditions for ssr env.

closes #6992

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[sheremet-va]

As I said in #6992 (comment) this is expected breaking change in Vite

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[sxzz]

@sheremet-va I just updated it to ssr.resolve.conditions.

[hi-ogawa]

Closing since this compat is implemented by Vite vitejs/vite#18857