Enhancement: Unkeyed artifacts list

[znicholasbrown]

Currently we only have components that show lists of artifacts that are either keyed (ArtifactCollections) or in the context of a flow run (FlowRunArtifacts) or task run (TaskRunArtifacts). This means that when a user creates artifacts without keys from any context (either a run or not) and goes to the artifacts page, they see an empty state, despite artifacts showing on the flow run and task run pages.

We should create another component that we can use to show and filter/sort unkeyed artifacts (and call them out as such) on the artifacts page.