GitLab

This danger check utilises `yarn-deduplicate` in order to show duplicate
dependencies in the yarn.lock dependency tree.
Often when introducing new dependencies or updating existing ones, yarn
does not seem to build the most optimal dependency tree.

In order to prevent those unnecessary dependency updates we are nudging
developers and maintainers to resolve these issues in MRs. Automating
this with danger especially helps, as yarn.lock files are not that easy
to review.

Replace the metrics dashboard graph with
GitLab UI's area chart component

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/51210

This suggests possibly related issues when the user types a title.

This uses GraphQL to allow the frontend to request the exact
data that is requires. We also get free caching through the Vue Apollo
plugin.

With this we can include the ability to import .graphql files in JS
and Vue files.
Also we now have the Vue test utils library to make testing
Vue components easier.

Closes #22071

This commit moves `mermaid` from blackst0ne-mermaid package to the
upstream version.

The reason why the fork was used was this bug[1].
The bug has been fixed, so there's no need to maintain my fork anymore.

[1]: https://github.com/knsv/mermaid/issues/584