Bug: gitlab project path is not always computed

[mdbenito]

gitlabHelper. registerProjectPath(settings.gitlab.projectId) is only called in transferIssues(). This means that if one sets settings.transfer.issues: false, the retrieval of attachments for comments in e.g. pull requests will fail in

node-gitlab-2-github/src/gitlabHelper.ts

Line 94 in 7572017

const attachmentUrl = host + this.projectPath + relurl;