refactor: move ToggleSkeleton to TypeScript

[gerzonc]

Closes #12565

Migrates ToggleSkeleton to TypeScript

Changelog

New

• Adds type ToggleSkeletonProps for ToggleSkeleton
• Adds partial type for defaultProps

Changed

• ToggleSkeleton is now a TypeScript file
• Ternary for aria-label now checks for undefined instead of null if there is a labelText present

Removed

• {{removed thing}}

Testing / Reviewing

{{ Add descriptions, steps or a checklist for how reviewers can verify this PR works or not }}

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[gerzonc]

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[alisonjoseph]

I think this may be an existing bug, but I quickly added a story for ToggleSkeleton locally so I can test and it looks like this 🤔

[gerzonc]

I think this may be an existing bug, but I quickly added a story for ToggleSkeleton locally so I can test and it looks like this 🤔

Yeah, that's how it looks like from the main branch. If there is some kind of design available just to see how it should look like, I would be glad to fix it right away. :)

[francinelucca]

Ran on main branch and confirmed broken styling:

Opened up new issue #13459.
Other than that this LGTM , @alisonjoseph should we add that issue as blocker for this one or is this good to merge? 🤔

[alisonjoseph]

Approving this, we can handle the visual bug and adding to storybook in a separate issue/PR 😄

@gerzonc looks like there is a small merge conflict in the readme

[francinelucca]

@gerzonc thanks for adding this, looks good! 🚀
After you solve the Readme.md merge conflicts and this should be good to go 🙏🏻