When configuring a proxy, Chromium requires a magic tokens to get some
local network requests to go through the proxy. This has tripped up a
few users, so we make the behavior default to the expected: proxy
everything including the local requests. This matches the other vendors
as well.
NB: This can be disabled via
`PLAYWRIGHT_DISABLE_FORCED_CHROMIUM_PROXIED_LOOPBACK=1`
Supercedes: #8345Fixes: #10631
