fix(ToggleSkeleton): update styles to match design specs

[jnm2377]

Closes #6222

Specs:

New

• added className for deprecated ToggleSmallSkeleton bc it required different styles, however shared all the same classNames

Changed

• updated styles for ToggleSkeleton

Testing / Reviewing

Review Toggle skeleton story to make sure it matches design specs.

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[laurenmrice]

• I think the skeleton looks good for the toggle itself.
• I think if the toggle is paired with label text above it, we will need to have a skeleton for the label text as well. Here are some specs for the label text above the toggle.

[andreancardona]

@jnm2377 Let me know when this is ready for review - with the updates. :)