fix!: don't exit process if config failed

[sheremet-va]

Description

An error in this function already triggers error handling here:

vitest/packages/vitest/src/node/cli/cac.ts

Line 247 in 6a0778d

catch (e) {

This affects public API - it's no longer needed to overwrite process.exit when initiating Vitest because there was no way to intercept this error.

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