extract issues from gitlab url

trinity-1686arequested to merge
trinity-1686a/torbot:detect-gitlab-url into main

fix #4 (closed)

it can do funny things if someone links to https://gitlab.torproject.org/core/tor/-/issues/1, that repo does not exists, but still gets resolved as tpo/core/tor. It's quirky but not problematic enough that it warrant the increased complexity imo

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