fix: exact match on bot users
We don't want to check if the given user is a substring of the GLUEBUDDY_GITLAB_BOT_USERS entries but an exact match as we specify the bot users in the given env var.
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We don't want to check if the given user is a substring of the GLUEBUDDY_GITLAB_BOT_USERS entries but an exact match as we specify the bot users in the given env var.