`<button>` elements are natively interactive, supported by any assistive technology, and must be used instead of non-semantic, non-accessible `<div>` elements.
Also, this change aligns the Media Widgets and the Customizer site icon and site logo controls with the design pattern used in the new Block Editor for similar controls.
Props ramonopoly, welcher, afercia.
Fixes#43151.
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* Eliminate Media control template from having dependency on `params.settings.default` for element ID, to fix compat with `params.settings` array or single `params.setting`. See #36167.
* Move description out of label and add `aria-describedby` to Media control's Select button. See #30738, #33085.
* Obtain notification container whenever content is (re-)rendered (such as for Media control). See #38794.
* Re-render notifications after control content is re-rendered, if control is in expanded section. See #38794.
Amends [41390].
See #36167, #38794, #33085, #30738.
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Prior to about 2013, many class methods lacked even access modifiers which made the `@access` notations that much more useful. Now that we've gotten to a point where the codebase is more mature from a maintenance perspective and we can finally remove these notations. Notable exceptions to this change include standalone functions notated as private as well as some classes still considered to represent "private" APIs.
See #41452.
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