This rethinks namespaces as a filter on list pages rather than a global setting.
The biggest net-new feature here is being able to select All (*) to list all jobs
or CSI volumes across namespaces.
This is extracted from #8094, where I have run into some snags. Since
these ESLint fixes aren’t actually connected to the Ember 3.16 update
but involve changes to many files, we might as well address them
separately. Where possible I fixed the problems but in cases where
a fix seemed too involved, I added per-line or -file exceptions.
