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httpcli: add retries to NewExternalHTTPClientFactory

Administrator requested to merge httpcli-retries into main

Created by: tsenart

This commit adds an error resilience transport middleware to the NewExternalHTTPClientFactory. This means that in every place we talk to the outside world via HTTP, we'll now automatically retry requests that meet the criteria defined in DefaultRetryPolicy.

To support retries, we increase the default timeout to 5 minutes.

This change is driven by intermittent failures in long external service syncing jobs that cause us to entirely fail the whole thing, when we can instead retry sporadic errors and deploys of github-proxy that happen frequently.

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