Find a better way to handle syncing custom values applied to product options

[good-idea]

Product option info returned from Shopify only includes the values as strings, i.e.:

{
  name: 'Color',
  id: '....shopifyId',
  values: ['Green', 'Blue', 'Yello']
}

sync-utils will then create a new entry for each of these values. But, if these values change in Shopify, (i.e. Yello is changed to Yellow), there is no way of knowing that this is the same option as before, but with a new name. (The sanity key for each of these entries is generated from the value itself)

So, for now:

• The old entry for Yello will stay in sanity and not be removed
• Users will need to copy values from Yello to Yellow

What would be nice:

• Flag outdated entries (Yello) as such
• Add some UI to the "Value" field in this entry, notifying the user that it's not linked to any option, and offering a button/menu that allows them to update the value by selecting a valid one (Yellow)