Add share link button to `skus` and `sku_lists`

[marcomontalbano]

What I did

We made several changes to meet the updated design:

• added the share link button to the skus and the sku_lists apps
• removed the links listing pages and moved the listing tables inside the skus and sku_lists detail pages
• replaced the New link buttons with lightning icon
• replaced the left action in link details to always open the link shown
• replaced all the top left action related to links modal page to have the Close label & the x icon and to point to the resource detail page

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