[BUG] Installation tests are broken

[dgozman]

Must be fixed for 1.25.

[mxschmitt]

(Caused by the last NPM release)

[rwoll]

Confirmed locally test passes with older npm@8, but fails after upgrade to https://github.com/npm/cli/releases/tag/v8.16.0

[rwoll]

Upstream npm/cli#5268

[rwoll]

Must be fixed for 1.25.

For now, I will pin to last working version of npm for these tests. Running npx playwright --help outside of project works fine on latest version; it's only when you combine it with npm_config_prefix setting (which our tests do), that it seems to be broken (and I suspect most users do not have a custom config prefix.)

Also note, per my upstream filing, it's not restricted to PW package. serve package exhibits the behavior as well.