Backport of Document support for ssh over SOCKS5 into v1.7

[teamterraform]

Backport

This PR is auto-generated from #33969 to be assessed for backporting due to the inclusion of the label 1.7-backport.

🚨

Warning automatic cherry-pick of commits failed. If the first commit failed,
you will see a blank no-op commit below. If at least one commit succeeded, you
will see the cherry-picked commits up to, not including, the commit where
the merge conflict occurred.

The person who merged in the original PR is:
@crw
This person should manually cherry-pick the original PR into a new backport PR,
and close this one when the manual backport PR is merged in.

merge conflict error: unable to process merge commit: "d04e5a09156eb18b75bf6ec0835ed1c1609d6c79", automatic backport requires rebase workflow

The below text is copied from the body of the original PR.

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Fixes #17754, surprisingly.

golang.org/x/net/proxy.FromURL (which Terraform uses to add support for HTTP and HTTPS) supports socks5 out of the box:

https://cs.opensource.google/go/x/net/+/refs/tags/v0.15.0:proxy/proxy.go;l=91

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Overview of commits

• 1c7cee6 - d04e5a0 - 80f748f

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