Enable setting HTTP proxies for VSC server with Remote - SSH

[EricHripko]

Overview

It seems like remote VS Code instances with Remote - SSH extensions are using the proxy configuration of the client environment. That doesn't always work as developer workstation may use a different set of proxies (or no proxies) unlike the target server being remoted to. Possibly related issue #957.

Environment

• Version of VS Code: 1.61.0
• What type of remote connection you were using: SSH
• Your operating system: Windows
• The remote operating system you are connecting to: Linux
• List of extensions that you have installed: attempting to install C/C++ extension

Steps to reproduce

• Have a local environment that doesn't require proxies or uses a different set of proxies from the target server
• Connect to the target server via Remote - SSH
• Attempt to install C/C++ extension extension
• After a while, the extension will be installed and will try to install its dependencies
• Dependencies will eventually fail to install:

Downloading package 'C/C++ language components (Linux / x86_64)'  Failed. Retrying... Failed. Retrying... Failed. Retrying...Waiting 8 seconds... Failed. Retrying...Waiting 15 seconds... Failed. Retrying...Waiting 15 seconds... Failed. Retrying...Waiting 15 seconds... Failed. Retrying...Waiting 15 seconds... Failed. Retrying...Waiting 15 seconds... Failed. Retrying...Waiting 15 seconds... Failed to download https://go.microsoft.com/fwlink/?linkid=2175018
Failed at stage: downloadPackages
Error: Failed to establish a socket connection to proxies: ["PROXY someredactedproxyhost"]

• Observe the failure due to VSCode server attempting to use client proxies (someredactedproxyhost is what my laptop is using and isn't applicable to the target server)

While the reproduction case use C/C++ extension, this also applies to any other extension that downloads additional dependencies.

[chrmarti]

Duplicate of #986, continuing there.

[EricHripko]

Sorry, didn't realise it was a duplicate! Thank you for quick triaging 👍