`devops::release` issues without a category label

Attention @ogolowinski, 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.

• #34356 (closed) Failure on qa/specs/features/ee/browser_ui/6_release/multi-project_pipelines_spec.rb ~"P1", Quality, ~"S1", ~"bug", ~"devops::release", found:staging.gitlab.com, missed:12.4
• #34355 (closed) Integration with 3rd secret management tool as part of the CI/CD pipeline - problem validation ~"Accepting merge requests", ~"devops", ~"devops::release", ~"group::release management", workflowvalidation backlog
• #34292 (closed) Is there a recommended way to use MigrationHelpers in an arbitrary rails project? database, ~"devops::release", groupdatabase, support request
• #34234 (closed) Refactor Feature Flag API in GraphQL GraphQL, api, ~"devops::release", ~"technical debt"
• #34231 (closed) Document Milestone <> Release feature Deliverable, auto updated, ~"backstage", ~"devops::release", documentation, workflowready for development
• #34130 (closed) Docs: deprecate old "Releases" doc Technical Writing, ~"devops::release", documentation
• #34051 (closed) Use Same Endpoint for HTML and JSON in OperationsController backend, ~"devops::release", ~"technical debt"
• #34004 If the first deploy to an environment failed, consider a "Retry deploy" button ~"devops::release", environments, ~"group::progressive delivery"
• #33901 (moved) Release team: Productive planning meeting auto updated, ~"devops::release"
• #33877 (closed) Stopping a stopped environment ~"bug", ~"devops::release", environments, ~"group::progressive delivery"
• #32687 (closed) Setting the value of a variable in an environment sometimes overwrites the value of the same variable in another environment ~"Accepting merge requests", Category:Continuous Integration, Enterprise Edition, ~"P2", ~"S2", ~"bug", ~"ci variables", ~"devops::release", ~"group::continuous integration", settings