`devops::release` issues without a category label

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

• - #37751 (closed) Explicit interfaces for MergeTrain domain ~"devops::release", ~"group::progressive delivery", ~"technical debt"
• - #37402 (closed) Transient failure in qa/specs/features/ee/browser_ui/6_release/multi-project_pipelines_spec.rb:77 ~"Accepting merge requests", ~"P1", QA, Quality, ~"S1", ~"bug", ~"devops::release", found:staging.gitlab.com
• - #37264 (closed) Transient failure in qa/specs/features/ee/browser_ui/6_release/pipelines_for_merged_results_and_merge_trains_spec.rb ~"Accepting merge requests", ~"Merge Trains", ~"P1", QA, Quality, ~"S1", ~"bug", ~"devops::release", found:staging.gitlab.com
• - #37080 Seed project release in development environment ~"devops::release", ~"group::release management"
• - #37070 (closed) (confidential) ~"(confidential)"
• - #36304 (closed) Failure in qa/specs/features/browser_ui/6_release/deploy_key/clone_using_deploy_key_spec.rb QA, Quality, ~"S1", ~"bug", ~"devops::release", found:nightly
• - #35918 (closed) Ref for merge train removed before manual cleanup steps ~"Merge Trains", ~"S4", ~"bug", ~"devops::release", ~"group::progressive delivery"
• - #35398 (closed) Review 12.5 Release feature doc requirement needs Technical Writing, ~"devops::release", docs-missing
• - #35022 (closed) Move models from EE to core code ~"devops::release", ~"group::progressive delivery", single codebase