chore: add test for npm package installing correctly (puppeteer#5714)

* chore: add test for npm package installing correctly

This command packs up the module and installs it again to check we're
correctly bundling everything we need to allow users to do a fresh
install.

* install realpath

chore: mark version v3.0.0 (puppeteer#5642)

Co-authored-by: Mathias Bynens <[email protected]>

chore: mark version v2.1.1 (puppeteer#5388)

chore: mark version v2.1.0 (puppeteer#5347)

This changes the Chromium revision to r722234 (Chrome 80.0.3987.0),
since that's the most recent version in the Chromium 80 range for
which a download exists for all supported platforms.

chore: mark version v2.0.0 (puppeteer#5078)

chore: mark version v1.20.0 (puppeteer#4928)

chore: mark version v1.19.0 (puppeteer#4744)

chore: mark version v1.18.1 (puppeteer#4628)

chore: mark version v1.18.0 (puppeteer#4606)

chore: mark version v1.17.0 (puppeteer#4467)