Merge branch 'labels-placement' into 'master'
Move Labels and Milestones as sub tab to Issues/MR ## What does this MR do? UI/UX change. Moves project labels and milestone tabs under Issues and Merge request tabs. ## Why was this MR needed? To solve problem of having to many tabs in top navigation. Since Labels and Milestones depends on Issue/MR feature it belongs to it and can be removed from top nav. ## What are the relevant issue numbers? Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/18368 ## Does this MR meet the acceptance criteria? - [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added - [x] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md) - not needed - [x] API support added - not needed - [x] Tests - [x] Added for this feature/bug - changed existing tests to match new behaviour - [x] All builds are passing - [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides) cc @jschatz1 @annabeldunstone @skyruler See merge request !4592
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