Remove the dev/report project

I find the presence of the Search and Reporting project to be unnecessarily confusing. It's not a repo, it's basically just a tag for dev/core issues. IMO we should delete the project and move all its issues over to dev/core and tag them as search-related.

I found these instructions on how to bulk-move issues: https://docs.gitlab.com/ee/user/project/issues/managing_issues.html#bulk-move-issues