Issue templates: Link Feature Proposals to SSoT about labels

Is https://gitlab.com/gitlab-org/gitlab/-/labels the SSoT for label descriptions? I noticed that gitlab-com/www-gitlab-com!66545 (merged) is almost word-for-word identical to it.

What does this MR do?

If yes, how about referring Feature-proposing users to that list?

Related issues

gitlab-com/www-gitlab-com!66545 (merged)

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