Composable table docs: `Prop component IActions missing from tsDocgen`

I have been seeing this warning appear in the dev server log when working on https://github.com/patternfly/patternfly-react/pull/6168:

I didn't think much of it until now, but I realized that the IActions type is not rendering at all in the Props section of the table docs pages. It is listed in the propComponents array at the top of ComposableTable.md, but the workspace can't find it.

The type definition is:

export type IActions = (IAction | ISeparator)[];

It's worth noting that if I put IAction or ISeparator into that propComponents array those render properly. So it seems there is an issue with parsing type declarations rather than interfaces. I'm not sure how we would render them though.

Start with the propComponents entry in ComposableTable.md and trace how the workspace's tsDocgen resolves those names. Compare the handling of IActions with IAction and ISeparator, then verify that the IActions type declaration renders in the Props section of the composable table docs without the warning.