Add 'light' prop to Toggle

[clarebyrne]

Detailed description

Describe in detail the issue you're having.
Need to add light={true} prop to a toggle component.
eg. see TextArea component, has 'light' prop

Is this issue related to a specific component?
-Toggle
-ToggleSmall

What did you expect to happen? What happened instead? What would you like to
see changed?
Need to add prop for component to display correctly on a light background

Additional information

Screenshot showing that toggles on light background do not display correctly

• Screenshots or code

• Notes

[emyarod]

cc @carbon-design-system/design do we have a spec for themed toggles?

[tw15egan]

It seems like if we add a light variation we could simply swap disabled-01 / disabled-02 on the ::before / ::after. The normal appearance does not seem to have any issues, just when the toggle is disabled.

[asudoh]

CC @carbon-design-system/design to see their input.

[aagonzales]

We're looking into it. We might be adjusting the tokens vs adding a light prop. We'll report back.

[aagonzales]

Has been fixed in this PR: #8514