`devops::verify` issues without a category label

Attention @jlenny, @DarrenEastman @jheimbuck_gl The following issues have been identified in the devops::verify stage that do not have a category label. These should be applied with urgency so that important issues are not being lost track of.

• #34343 (closed) (confidential) ~"(confidential)"
• #34288 (closed) before_script documentation devopsverify, docsimprovement, documentation, ~"group::continuous integration", support request
• #34108 (closed) Select or search/filter manual CI jobs customer, devopsverify, feature
• #34077 (closed) job made manual by rules are not optional devopsverify, ~"group::continuous integration", support request
• #34071 (closed) Allow Project/Group level variables to be expanded in .gitlab-ci.yml "include" values devopsverify, feature, ~"group::continuous integration"
• #33947 (closed) Automatic cancellation of manual non-interruptible tasks ci-build, devopsverify, feature, ~"group::continuous integration"
• #33925 (closed) Merge train "previous ref does not exist" error ~"Merge Trains", ~"P2", ~"S3", ~"bug", devopsverify, ~"group::continuous integration"
• #33912 (closed) CI: "only: tags" is confused when the branch has the same name as another tag ~"P4", ~"S4", ~"bug", devopsverify, ~"group::continuous integration"
• #30810 (closed) Editing files is not obvious in blob view Deliverable, UI polish, UX, ~"Verify [DEPRECATED]", devopsverify, feature, frontend, ~"group::continuous integration", web edit, ~"web ide", workflowready for development