feat(action-sheet): add htmlAttributes property for passing attributes to buttons (#27863)

Issue number: N/A

---------

## What is the current behavior?
Buttons containing only icons are not accessible as there is no way to
pass an `aria-label` attribute (or any other html attribute).

## What is the new behavior?
- Adds the `htmlAttributes` property on the `ActionSheetButton`
interface
- Passes the `htmlAttributes` to the buttons (both the buttons array and
the cancelButton)
- Adds two tests to verify `aria-label` and `aria-labelled-by` are
passed to a button with and without the cancel role - this was done
because action sheet breaks these buttons up when rendering

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

core/src/components/action-sheet/action-sheet-interface.ts

@@ -23,6 +23,7 @@ export interface ActionSheetButton<T = any> {
   icon?: string;
   cssClass?: string | string[];
   id?: string;
+  htmlAttributes?: { [key: string]: any };
   handler?: () => boolean | void | Promise<boolean | void>;
   data?: T;
 }