View images in a lightbox rather than new tab
## Context This issue is the first step towards a vision of viewing image within GitLab: 1. This issue 2. View images in a markdown table with pagination https://gitlab.com/gitlab-org/gitlab/-/issues/377399 3. View gallery of images in markdown table https://gitlab.com/gitlab-org/gitlab/-/issues/255621/ 4. View gallery in design management https://gitlab.com/gitlab-org/gitlab/-/issues/255621/ ## Steps for Closure * [x] Come to agreement on ~"group::knowledge" ownership * [x] Create and agree on final designs * [x] Carve out and develop :thumbsup: ## Problem When viewing an image in GitLab, the image opens in a new tab. I lose the context of where I was. ![newtab](/uploads/ab5d51e3e6f63e22f7bbb5064431b15c/newtab.gif) ## Proposal When clicking on images within GitLab, (for example in comments, MRs, issue body...) open the image in a light box style: https://gitlab.com/gitlab-org/gitlab/-/issues/377398/designs/Lightbox.png This reuses elements of design management
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