[expansion panel] JAWS does not read content of expansion panel when selected

[jessithompson]

Describe the bug: With JAWS sceenreader active, selecting an expansion panel doesn't announce the content of the expansion panel.

To Reproduce: Steps to reproduce the behavior:

1. Go to ButtonArea in Expansion Panel story in the Forge Storybook (https://forge.tylerdev.io/main/?path=/story/components-button-area--in-expansion-panel)
2. Ensure JAWS is running
3. Navigate using keyboard to the expansion panel

Expected behavior: The screenreader should say something like "Heading toggle panel button collapsed. To activate press enter." (This is because the text in the expansion panel says "Heading".)

Screenshots:

Please complete the following information:

• Forge version: v2.22.0
• I have searched existing issues before creating this report? Y
• Browser: Chrome, Firefox
• Platform: desktop
• OS: Windows

Additional context: Today, the screenreader just says "toggle panel button collapsed. To activate press enter” when the expansion panel is selected.