Add default proxy credentials when connecting to GitHub #2507
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Description
Primarily, this adds the default credentials as the default proxy credentials when connecting to GitHub. This is per dotnet/runtime#25745 (comment). I've tested this in our environment (where this had previously failed), and the issue is resolved.
Additionally, the code had a workaround for a missing Octokit hook to increase the timeout on uploading release assets. This has since been added to Octokit in octokit/octokit.net#1693, so I've replaced the workaround with code to make use of this instead.
Fixes #2505