[Lens](Accessibility) convert select a function buttons to radio group for better screen reader support

[mbondyra]

Select a function buttons act like a radio group. They should be a radio group.

This is a leftover issue from #83872

[elasticmachine]

Pinging @elastic/kibana-accessibility (Project:Accessibility)

[elasticmachine]

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

[wylieconlon]

Because the "choose a function" options are using an EuiListGroup I think we have three options, but I'm not sure which one is best:

• Look for a way to set aria properties to indicate a radio group without modifying EUI
• Modify EUI to support radio-style buttons
• Change the implementation to not use EuiListGroup to implement it as a radio group

My preference is to contribute to EUI if it's a common enough use case.

[myasonik]

@elastic/eui-design Do y'all have a preference and/or any guidance?

[myasonik]

Talked to @cchaos about this and she convinced me that this works just as well as a toggle button as a radio input and a toggle button is loads easier to implement so let's go with that!

All that needs to happen to make it a toggle button is add aria-pressed={true/false} to each EuiListGroupItem.