publish new product page apis

changes:
Service $w.ProductPage has a new operation getSelectedVariantId
Service $w.ProductPage has a new operation getCustomText
Service $w.ProductPage has a new operation setAddToCartLabel
Service $w.ProductPage has a new operation onChoiceSelected
Service $w.ProductPage has a new operation onAddToCart
Service $w.ProductPage has a new operation setBuyNowLabel
Service $w.ProductPage has a new operation setQuantity
Service $w.ProductPage has a new operation getQuantity
Service $w.ProductPage has a new operation getSelectedChoices
Service $w.ProductPage has a new operation onQuantityChanged
Service $w.ProductPage has a new operation onBuyNow
Service $w.ProductPage has a new callback choiceSelectedEventHandler
Service $w.ProductPage has a new callback addToCartEventHandler
Service $w.ProductPage has a new callback quantityChangedEventHandler
Service $w.ProductPage has a new callback buyNowEventHandler

issues:
Mixin $w.Element not found (CartIcon.js (1))
Mixin $w.HiddenCollapsedMixin not found (CartIcon.js (1))
Message SeoTag has an unknown property type object (ProductPage.js (161))
Message SeoTag has an unknown property type object (ProductPage.js (161))
Mixin $w.Element not found (ProductPage.js (1))
Mixin $w.HiddenCollapsedMixin not found (ProductPage.js (1))
Mixin $w.Element not found (ThankYouPage.js (1))
Mixin $w.HiddenCollapsedMixin not found (ThankYouPage.js (1))
Browserslist: caniuse-lite is outdated. Please run:
npx browserslist@latest --update-db

Why you should do it regularly:
https://github.com/browserslist/browserslist#browsers-data-updating
ERROR: The @snippet tag - file 'velo-docs/examples/ThankYouPage-getOrder_pickup.es6' not found. File: ThankYouPage.js line: 157

Co-authored-by: Rebecca Skurnik <rebeccask@wix.com>

wixstores-client-worker/$w/CartIcon.service.json

@@ -3,8 +3,7 @@
   "mixes":
     [ "$w.Element",
       "$w.HiddenCollapsedMixin" ],
-  "labels":
-    [ "changed" ],
+  "labels": [],
   "location":
     { "lineno": 1,
       "filename": "CartIcon.js" },
@@ -152,8 +151,7 @@
         "extra":
           {  } },
       { "name": "addToCart",
-        "labels":
-          [ "changed" ],
+        "labels": [],
         "nameParams": [],
         "params":
           [ { "name": "productID",