Danger bot suggests splitting MRs that change generated files
<!--IssueSummary start-->
<details>
<summary>
Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards.
</summary>
- [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=24541)
</details>
<!--IssueSummary end-->
Example MR that adds a yarn dependency: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/22130
> This merge request is quite big (more than 1166 lines changed), please consider splitting it into multiple merge requests.
Suggestion:
Ignore generated files when doing line count:
- `Gemfile.lock`
- `yarn.lock`
- `doc/api/graphql/reference/*`
issue