Fix switch accessibility

[rilrom]

Fixes #5699.

Things to note:

• Due to the implementation of role="switch", some tests needed to be adjusted.
• Screen readers no longer read out the onLabel and offLabel values, however I consider this to be appropriate as the label or aria-label should be used to provide enough context that these values are not needed.
• Screen reader testing was conducted across macOS VoiceOver and Windows NVDA.
• Open to suggestions on types for bodyElement and labelElement.