Revert "test: mess process"

This reverts commit 1538626.

packages/vitest/src/runtime/entry.ts

@@ -17,10 +17,7 @@ export async function run(files: string[], config: ResolvedConfig): Promise<void
     __vitest_worker__.filepath = file
 
     await withEnv(env as BuiltinEnvironment, config.environmentOptions || {}, async() => {
-      const cacheProcess = process
       await startTests([file], config)
-      // eslint-disable-next-line no-global-assign
-      process = cacheProcess
     })
 
     __vitest_worker__.filepath = undefined

test/core/test/basic.test.ts

@@ -2,12 +2,6 @@ import { assert, expect, it, suite, test } from 'vitest'
 import { two } from '../src/submodule'
 import { timeout } from '../src/timeout'
 
-test('mess process', () => {
-  // eslint-disable-next-line no-global-assign
-  process = 1 as any
-  expect(process).toBe(1)
-})
-
 test('Math.sqrt()', async() => {
   assert.equal(Math.sqrt(4), two)
   assert.equal(Math.sqrt(2), Math.SQRT2)