Use more props to make the `SkeletonTable` match the actual table visually

[bastilian]

Currently we use the SkeletonTable very barebones, by only setting the rows and columns, but there are more props[0] that could be set to make the SkeletonTable match the visual appearance of the actual table.

For this we should

• Set is isExpandable if the table has a details component
• Set isSelectable if bulk select is enabled
• Set the appropriate variant (compact or not)
• Set the right selectVariant (radio/checkbox)

In the course of this change we could also look into exposing enabled features via the context to make them easily accessible anywhere in the table.

[0] https://www.patternfly.org/component-groups/status-and-state-indicators/skeleton-table/#props