Remove `design_management_allow_dangerous_images`
<!-- Title suggestion: [Feature flag] Enable description of feature --> ## What Remove the `:design_management_allow_dangerous_images` feature flag. ## Owners - Team: ~"group::knowledge" - Most appropriate slack channel to reach out to: `#f_design-management` - Best individual to reach out to: @.luke ## Expectations ### What are we expecting to happen? Users will be able to upload SVG images within design management. ### What might happen if this goes wrong? There may be a security issue around serving SVGs. Note, the security implications have been addressed in the MR https://gitlab.com/gitlab-org/gitlab/merge_requests/16160 including a sign-off from the security team. However, we want to further assess this in production. ### What can we monitor to detect problems with this? Work with security to verify that having this feature enabled is safe. ## Beta groups/projects - `gitlab-org/gitlab` project ## Roll Out Steps - [x] Enable on staging - [x] Test on staging https://gitlab.com/gitlab-org/gitlab/-/issues/34279#note_302877400 - [ ] Ensure that documentation has been updated - [x] Enable on GitLab.com for individual groups/projects listed above and verify behaviour - [x] Coordinate a time to enable the flag with `#production` and `#g_delivery` on slack. - [ ] Announce on the issue an estimated time this will be enabled on GitLab.com - [ ] Enable on GitLab.com by running chatops command in `#production` - [ ] Cross post chatops slack command to `#support_gitlab-com` and in your team channel - [ ] Announce on the issue that the flag has been enabled - [ ] Remove feature flag and add changelog entry - [ ] After the flag removal is deployed, [clean up the feature flag](https://docs.gitlab.com/ee/development/feature_flags/controls.html#cleaning-up) by running chatops command in `#production` channel
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