[Feature] playwright install installs all default browser even if it is called from playwright-chromium

[sapphi-red]

playwright install installs not only chromium (firefox, webkit) even if the playwright command exists in playwright-chromium.
If playwright-chromium is installed instead of playwright, user will only use chromium. So I think it makes sense to only install chromium by default.

To reproduce

cd /foo # an empty directory
npm i playwright-chromium
npx playwright install

[mxschmitt]

After a discussion with the team it is for now expected that all browsers get installed when not specifying a browser name.

We recommend passing chromium manually for now: npx playwright install chromium or migrating to the playwright-core package, so you don't have a postinstall step at all and can manually decide which browser you want to install.

[pavelfeldman]

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