fix(styles): add user-select: none to toggle

[joshblack]

Closes #10881

Add user-select: none to toggle to prevent text selection.

Changelog

New

Changed

• Update .cds--toggle select to set user-select: none

Removed

Testing / Reviewing

• Verify that text selection no longer occurs when quickly clicking the toggle
• Review the approach of setting user-select: none to see if this is too broad of a change and if this should be more specific

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[tay1orjones]

Can confirm this fixes it. The only potential downside I see is that the label is no longer selectable/highlight-able

label.can.not.be.highlighted.mov

I'm not aware of any a11y requirement or similar that would require the text be selectable, so I think it's a fine tradeoff? I also can't think of a strong use case for someone to need to select/highlight the label for copy/paste 🤔