Refactor: CalciteSwitch - modify calciteSwitchChange event payload before 1.0 release

[driskull]

We should modify modify calciteSwitchChange event payload to not emit redundant props before 1.0 release.

As part of https://github.com/Esri/calcite-components/pull/3162, we deprecated the switched property in favor of checked but the event payload still has a switched property on it.

[github-actions[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[geospatialem]

calciteSwitchChange event payload has been modified to event.target.checked via https://github.com/Esri/calcite-components/pull/5921. Closing in favor of the deprecation epic #5798