Update svg-icons to 1.12

Twin MR with Libre's: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/17489

What does this MR do?

Updates gitlab-svgs to 1.12

Are there points in the code the reviewer needs to double check?

I've ran yarn run svg and committed all changes.

Why was this MR needed?

Some new icons have been added than need to be available for some features in development. And to keep things up to date! ;)

Screenshots (if relevant)

N/A

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary Not added.
• Documentation created/updated
• Review
  • Has been reviewed by Frontend
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together

What are the relevant issue numbers?

N/A