(Accessibility) Query string input - ARIA Role missing required child elements

[barlowm]

Steps to reproduce

Navigate to any query string input. One example is found on Lens:

1. From Kibana Home Page, use the side navigation bar to navigate to the "Visualize" page
2. Click the "Create visualization" button
3. Click the "Go to Lens" button

Errors

• Search combo box has role="combobox" but no reference to what the contents of the combobox should be.
• The child `role="listbox" also need an accessible name.

Relevant WCAG Criteria

• 1.3.1 Info and Relationships - Level A
• 4.1.2 Name, Role, Value - Level A

Relevant ARIA spec
3.14 Listbox - A listbox widget presents a list of options and allows a user to select one or more of them. A listbox that allows a single option to be chosen is a single-select listbox; one that allows multiple options to be selected is a multi-select listbox.

[elasticmachine]

Pinging @elastic/kibana-app (Team:KibanaApp)

[wylieconlon]

This is a shared component, not a Lens-specific one. Going to update the labels and description

[elasticmachine]

Pinging @elastic/kibana-app-arch (Team:AppArch)

[elasticmachine]

Pinging @elastic/kibana-data-discovery (Team:DataDiscovery)

[elasticmachine]

Pinging @elastic/kibana-visualizations (Team:Visualizations)