`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.

• - #55353 (closed) Projects::MergeRequests::DiffsController#show.json has slow SQL queries ~"devops::release", diff, ~"performance"
• - #43592 (closed) Research: Front end tech debt for Release ~"devops::release", ~"group::release management", workflowscheduling
• - #43588 (closed) Research: Think Big Product Front End Experience in Release Management ~"devops::release", ~"group::release management", workflowscheduling
• - #43306 (closed) Merge Trains for www-gitlab-com rollout plan ~"Merge Trains", auto updated, ~"devops::release", ~"group::progressive delivery"
• - #39473 (closed) Allow a Release's tag to be changed through the "Edit Release" page ~"devops::release", ~"group::release management"
• - #39472 (closed) Allow a Release's asset links to be edited through the "Edit Release" page ~"devops::release", ~"group::release management"
• - #39471 (closed) Allow a Release's release date to be edited through the "Edit Release" page ~"devops::release", ~"group::release management"
• - #39467 (closed) Allow a Release's associated Milestones to be edited through the "Edit Release" page ~"devops::release", feature, ~"group::release management"
• - #39197 (closed) Use state_machine in MergeTrain ~"devops::release", ~"group::progressive delivery"
• - #39089 (closed) Update ECS task definition ~"devops::release", feature, ~"group::progressive delivery"
• - #39057 (closed) Support Resource Group for cross-project (parent/child) pipelines ~"devops::release", ~"group::progressive delivery"
• - #38316 (closed) Docs feedback: The "Releases" page does not explain including git submodules ~"devops::release", docs-only, documentation
• - #35779 (closed) Can't push using Deploy Key after update from 12.3.x to 12.4.1 (This action cannot be performed by internal users, Your account has been blocked) ~"bug", customer, deploy keys, ~"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 ~"Accepting merge requests", ~"devops::release", ~"group::progressive delivery", single codebase
• - #31711 (closed) Improve docs experience for Experience Baseline JTBD: Create a Release and update it OKR, Technical Writing, ~"devops::release", docs-only, documentation
• - #30769 (closed) Allow Deploy keys to push to protected branches once more Category:Source Code Management, Deliverable, ~"P2", ~"S2", backend, ~"bug", customer, ~"devops::release", groupsource code, needs investigation, regression, regression:12.0, repository, workflowready for development
• - #29761 Deploy key no longer has access to protected branches ~"Accepting merge requests", ~"S3", backend, ~"bug", deploy keys, ~"devops::release", ~"group::progressive delivery", repository
• - #29760 Deploy keys aren't allowed to push anymore when push rule "Reject unsigned commits" is checked ~"Accepting merge requests", Category:Source Code Management, deploy keys, ~"devops::release", ~"enhancement", feature, ~"group::progressive delivery", repository