Improve the Dashboard News widget no-js notice

[afercia]

When JS is off, the News widget displays a notice:

In a few other places in the admin, these kind of notices use the CSS notices styling:

It would be nice, for consistency, to use the same styling.

[afercia]

Screenshot with the patch applied:

Couple notes:

I'd propose to remove the overflow: hidden property set on the form for the configurable widgets, because the focus style around focusable elements gets cut-off:

The patch uses the CSS class wp-clearfix instead of overflow: hidden

The patch removes the selector #dashboard_primary .dashboard-widget-control-form because it targets the configurable widgets form: the News widget (#dashboard_primary) is not configurable any longer since the Dashboard redesign, so this selector seems a leftover. See [26144] and [26230]

It was used in WordPress 3.7 and before, for the Primary feed (Dev Blog) Widget. At that time, the News widget was the Secondary Feed (Planet) Widget. Screenshot from WordPress 3.7:

To test:

• disable JavaScript in your browser
• delete the widget transient, on VVV this can be quickly done via vagrant ssh and then using wp transient delete --all

[afercia]

Could also use the normal notice, without notice-alt. For comparison:

Current:

Normal notice:

Alternative notice style:

[SergeyBiryukov]

Replying to afercia:

Could also use the normal notice, without notice-alt.

Normal notice looks better to me and more consistent with other instances.

[afercia]

Refreshed patch to use the default notice styling.

[afercia]

In 40556:

Widgets: Improve the News dashboard widget no-js notice.

In the rare case this notice was displayed, it was unstyled. Uses the notice
error style to make it prettier and consistent with other no-js notices.
Also, some CSS clean-up.

Fixes #40529.