fix(overlays): hide the focus trap div from screen readers (#29970)

Issue number: resolves #29858

---------

## What is the current behavior?
When swiping between elements using Android TalkBack, a green box is
shown for certain overlays and it gains focus at the beginning and end
of those overlays:

<img width="419" alt="Screenshot 2024-10-25 at 2 44 45 PM"
src="https://github.com/user-attachments/assets/dffd8126-ec1d-4b6f-87fc-6488c7c09aab">

## What is the new behavior?
The `aria-hidden` attribute is now added to the focus trap divs to hide
them from screen readers, without preventing these divs from trapping
keyboard focus.

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

## Other information
Dev build: `8.3.4-dev.11729882231.1b2e7f13`

core/src/components/action-sheet/action-sheet.tsx

@@ -385,7 +385,7 @@ export class ActionSheet implements ComponentInterface, OverlayInterface {
       >
         <ion-backdrop tappable={this.backdropDismiss} />
 
-        <div tabindex="0"></div>
+        <div tabindex="0" aria-hidden="true"></div>
 
         <div class="action-sheet-wrapper ion-overlay-wrapper" ref={(el) => (this.wrapperEl = el)}>
           <div class="action-sheet-container">
@@ -446,7 +446,7 @@ export class ActionSheet implements ComponentInterface, OverlayInterface {
           </div>
         </div>
 
-        <div tabindex="0"></div>
+        <div tabindex="0" aria-hidden="true"></div>
       </Host>
     );
   }