Remove link.color.visited token

[mimarz]

This token is no longer in use.

Need to add changeset for deprecation and remove at a later date.

• Users can override --dsc-link-color--visited on ds-link if needed.
• By default visited uses --ds-color-text-subtle in code and Figma.

[Febakke]

Note to self:
FIx this bug in Figma when removing this. Right icon in link visited in Figma is connected to an old variable no longer in use.