fix(BrowserFetcher): fix httpRequest when using proxy against http HOST (#4558)
fix(BrowserFetcher): fix httpRequest when using proxy against http HOST (#4558)

This patch avoids https-proxy-agent usage when target host protocol is http and proxy is specified.
This is a valid scenario for installer but was failing.

Fixes #4556

GoogleChrome/puppeteer,GoogleChrome/puppeteer,puppeteer/puppeteer,GoogleChrome/puppeteer,puppeteer/puppeteer,puppeteer/puppeteer,puppeteer/puppeteer