kubernetes: Fix css for expandable rows
kubernetes: Fix css for expandable rows

When a row is expanded, clicking on a row should only collapse it, never
navigate. The highlighting needs to reflect this: on hover the row is
gray, but the caret is highlighted.

Closes #4727
Reviewed-by: Stef Walter <8a7fbf0f15d3ad982af54ef28f5c117d2494b76c@redhat.com>

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