Gutenberg: Regression: The inserter search results don't use an audible message any longer

[afercia]

Previously, when searching for a block type in the inserter, the number of search results (or "no results") was made available to users of assistive technologies by sending a message to the assertive live region. The screenshot below is from Gutenberg 2.5:

Since then, the inserter has gone through various iterations and is now notably different. However, the several changes to the UI have apparently missed to re-implement the audible messages. On current master 4.0.0-rc.1 the search results are not announced at all, no message is sent to the live region.

This is a pretty important regression, as now users don't have a clue what happens when they type something in the search field.

[LukePettway]

So far from what I can see debounceSpeak doesn't seem to be called anywhere within any of the components callbacks. Looking at other components such as hierarchical-term-selector, it looks like it _should_ be explicitly calling that method.

I'll play around with this more but I think I may be close to a solution.

[youknowriad]

Looks like this is fixed by #10755