Apply the network-concurrency option to the package fetchers #2178
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Summary
This is a follow-up from #2129 where the network concurrency was not being passed down to the package fetcher, so the problem was not fixed in that scenario.
Test plan
Running
yarn install --concurrency 1
on https://github.com/albertfdp/yarn-github-repos should not raise a Connection reset by peer error.