adapter-vercel shouldn't wipe .vercel/output

[Rich-Harris]

Describe the bug

This line is problematic...

kit/packages/adapter-vercel/index.js

Line 213 in c956744

builder.rimraf(dir);

...because it wipes files that vc build places in that directory. vc build also empties the directory, which is enough.

Reproduction

Going to break my own rule and skip a repro for this one, since it's best demonstrated with a canary version of the Vercel CLI

Logs

No response

System Info

latest everything

Severity

annoyance

Additional Information

No response

[mrkldshv]

Hey! I'm thinking to take this issue. As mentioned in the issue, vercel build removes potentially existing output directory, so I guess we can just remove this line from the adapter code, because it does the same.