cmd/gopherbot: extend gopherbot's general tasks to the vscode-go repo

GopherBot has a few tasks, such as automatically applying labels and
closing stale issues, which are applicable to all golang.org/x repos,
not just golang/go. This change makes these work for golang/go and
golang/vscode-go, with the eventual intention of making them work for
more repos.

Updates golang/go#39008

Change-Id: I4aad54822422747aeac25590de3069562bebb3a5
Reviewed-on: https://go-review.googlesource.com/c/build/+/233377
Run-TryBot: Rebecca Stambler <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>

Author: stamblerre