Revert UI queueing (#6789, #6829, #6840) - #6900

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4.2.2, actions/setup-dotnet@v4.1.0, actions/upload-artifact@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

'IComponent.Owner' is obsolete: 'Update your API to allow accessing Owner through other means'

'Logger.WarningS(string, string)' is obsolete: 'Use ISawmill.Warning'

'SharedTransformSystem.SetLocalRotation(TransformComponent, Angle)' is obsolete: 'use override with EntityUid'

'SharedTransformSystem.SetLocalRotation(TransformComponent, Angle)' is obsolete: 'use override with EntityUid'

'Component.Owner' is obsolete: 'Update your API to allow accessing Owner through other means'

'EntitySystem.TryGet<T>(out T?)' is obsolete: 'Either use a dependency, resolve and cache IEntityManager manually, or use EntityManager.System<T>()'

'IComponent.Owner' is obsolete: 'Update your API to allow accessing Owner through other means'

'ComponentTreeSystem<TTreeComp, TComp>.QueryAabb(HashSet<ComponentTreeEntry<TComp>>, MapId, Box2Rotated, bool)' is obsolete: 'Use Entity<T> variant'

'Component.Owner' is obsolete: 'Update your API to allow accessing Owner through other means'

'PartialTypeInfo.CheckPartialDiagnostic(SourceProductionContext, DiagnosticDescriptor)' is obsolete: 'Diagnostics from source generators are recommended against, apparently: https://github.com/dotnet/roslyn/issues/71709'

'Component.Owner' is obsolete: 'Update your API to allow accessing Owner through other means'

'EntityManager.StartComponents(EntityUid)' is obsolete: 'Use StartEntity'

'EntityManager.InitializeComponents(EntityUid, MetaDataComponent?)' is obsolete: 'Use InitializeEntity'

'SharedTransformSystem.SetLocalRotation(TransformComponent, Angle)' is obsolete: 'use override with EntityUid'

'SharedTransformSystem.SetLocalRotation(TransformComponent, Angle)' is obsolete: 'use override with EntityUid'

'EntitySystem.TryGet<T>(out T?)' is obsolete: 'Either use a dependency, resolve and cache IEntityManager manually, or use EntityManager.System<T>()'

'Component.Owner' is obsolete: 'Update your API to allow accessing Owner through other means'

'Logger.Warning(string)' is obsolete: 'Use ISawmill.Warning'

'ComponentTreeSystem<TTreeComp, TComp>.QueryAabb(HashSet<ComponentTreeEntry<TComp>>, MapId, Box2Rotated, bool)' is obsolete: 'Use Entity<T> variant'