fix(pipeline): check existence of path before creation

[zakkarry]

in the case of windows users using a drive letter only for their paths (X:\\) then mkdir will fail for operation not permitted, as you cannot create a drive letter.

this will check if the path exists before creation, if so it wont attempt to create it preventing a stack from being thrown.

  const result = binding.mkdir(
                         ^

Error: EPERM: operation not permitted, mkdir 'Z:\'
    at Object.mkdirSync (node:fs:1373:26)
    at main (file:///C:/Users/Audio.Main/AppData/Roaming/npm/node_modules/cross-seed/dist/pipeline.js:183:8)
    at async Command.<anonymous> (file:///C:/Users/Audio.Main/AppData/Roaming/npm/node_modules/cross-seed/dist/cmd.js:235:9)
    at async Command.parseAsync (C:\Users\Audio.Main\AppData\Roaming\npm\node_modules\cross-seed\node_modules\commander\lib\command.js:923:5)
    at async file:///C:/Users/Audio.Main/AppData/Roaming/npm/node_modules/cross-seed/dist/cmd.js:244:1 {
  errno: -4048,
  code: 'EPERM',
  syscall: 'mkdir',
  path: 'Z:\\'
}