BBOT's gitlab.py exposes globally configured "gitlab" API key
### Summary
bbot's `gitlab.py` sends the user's "gitlab" API key to on-premise GitLab instances.
If a user has configured a
gitlab.com API key using this mechanism, it may be leaked to an attacker-controlled server.
### Impact
A user with a "gitlab" API key configured who uses bbot to scan a malicious webserver may leak their
gitlab.com API key to an untrustworthy server.