Table layout: Only show row hover styles when bulk actions exist

[jameskoster]

A hover style suggests interactivity. Normally clicking a table row will select it. However when there are no bulk actions clicking a row will do nothing, which arguably makes the hover style a bit misleading.

As an example, view Theme Patterns:

patterns.mp4

One potential argument for retaining the hover style is that it can be a useful visual aid when scanning dense data tables horizontally, but I think there are better solutions to that like pinning columns (#64679).

cc @WordPress/gutenberg-design for thoughts on this one.

[jasmussen]

Makes sense.