[iOS][Accessibility] Narrator is not reading the selection action title for the Rich Text Block

Spun off from #4856

Platform

• iOS

Details

With the below RichTextBlock, Narrator should read "Click me" when the focus is on the RichTextBlock. We need to confirm that this is the current behavior on iOS and fix if necessary.

{
  "type": "AdaptiveCard",
  "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
  "version": "1.3",
  "body": [
    {
      "type": "RichTextBlock",
      "inlines": [
        {
          "type": "TextRun",
          "text": "This is the text",
          "selectAction": {
            "type": "Action.Submit",
            "title": "Click me"
          }
        }
      ]
    }
  ]
}

Start by reproducing the provided Adaptive Card on iOS with accessibility focus on the RichTextBlock and verify whether the selection action title is announced. Done means confirming or fixing the behavior so the title "Click me" is read when the RichTextBlock is focused; the payload names no source file or test.