fix: use `fs.existsSync` to avoid race condition (#56387)
Using `await fs.access` has couple of downsides. It creates unnecessary
async contexts where async scope can be removed. Also, it creates the
possibility of race conditions such as `Time-of-Check to Time-of-Use`.
It would be nice if someone can benchmark this. I'm rooting for a
performance improvement.
Some updates from Node.js land:
- There is an open pull request to add V8 Fast API to `existsSync`
method - https://github.com/nodejs/node/pull/49893
- Non-existing `existsSync` executions became 30% faster -
https://github.com/nodejs/node/pull/49593
Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>