Remove support for elements with only worker versions

https://redmine.teklia.com/issues/7063

Requires backend#1785 (closed)

• The element types in src/types/index.ts need to be updated to remove the worker_version and worker_version_id attributes.
• In src/components/Element/PanelHeader.vue, remove the WorkerVersionDetails, leaving only the WorkerRunSummary.
• In src/components/Navigation/ChildrenTree/ChildrenTree.vue, only support filtering by worker run and not by worker version.