Switch: Set aria-checked value to "true" and "false"

[austinoneil]

Description

Previous implementation was passing a boolean in as the attribute value. New implementation passes in a string.

References #2143

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

How Has This Been Tested?

Add e2e checks, update unit tests

https://deploy-preview-2450--moduswebcomponents.netlify.app/?path=/story/user-inputs-switch--medium

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

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[coliff]

This is an improvement so I'll get this merged - thanks!
Still things to fix with switches though:

• Should really change aria-checked to just checked
• labels should match ids set on the input
• screen reader support is currently not working at all for this component.