refactor: remove redundant mkdirp from installMultiple
refactor: remove redundant mkdirp from installMultiple

`symlink-dir` creates all the missing directories.

pnpm/pnpm,pnpm/supi,rstacruz/pnpm,pnpm/supi,pnpm/pnpm,rstacruz/pnpm,pnpm/pnpm,rstacruz/pnpm,pnpm/supi