Improve/Fix 'console.dashboards/overview/detail/item' Extension

The extension `console.dashboards/overview/detail/item` doesn't constrain the content to fit the card.

The details-card has an expectation that a <dd> item will be the last item (for spacing between items). Our static details-card items use a component called 'OverviewDetailItem'. This isn't enforced in the extension and can cause undesired padding issues if they just do whatever they want.

I feel our approach here should be making the extension take the props of 'OverviewDetailItem' where 'children' is the new 'component'.

Acceptance Criteria:

• Deprecate the old extension (in docs, with date/stamp)
• Make a new extension that applies a stricter type
• Include this new extension next to the old one (with the error boundary around it)