Puppeteer Delay is not supported

[garris]

Puppeteer Delay feature is no longer supported.

If someone would submit a solution as a backfill (e.g. the promise timeout workaround mentioned here puppeteer/puppeteer#11780) I would gladly publish this backward compatibility fix!

Originally posted by @furai in #1550 (comment)
👇

This update broke delay functionality.
https://github.com/garris/BackstopJS/blob/master/core/util/runPuppet.js#L178
This line is now giving errors.

Puppeteer had breaking changes reported in their release notes:
https://github.com/puppeteer/puppeteer/releases/tag/puppeteer-core-v22.0.0

I guess that example scripts in init also need updating.