fix: add global chai variable in vitest/globals (fix: #7474) (#7771)

Author: Jay-Karia

packages/vitest/globals.d.ts

@@ -1,6 +1,7 @@
 declare global {
  const suite: typeof import('vitest')['suite']
  const test: typeof import('vitest')['test']
+ const chai: typeof import("vitest")["chai"]
  const describe: typeof import('vitest')['describe']
  const it: typeof import('vitest')['it']
  const expectTypeOf: typeof import('vitest')['expectTypeOf']