online-store-theme -> apps-and-themes rename (#2519)

Using the new name for this translation scheme.

translation.yml

@@ -5,14 +5,14 @@ async_pr_mode: per_pr
 components:
   - name: buyer
     audience: buyer
-    scheme: 'online-store-theme'
+    scheme: 'apps-and-themes'
     owners: ['@Shopify/themes-translations']
     paths:
       - locales/{{language}}.json
   - name: merchant
     target_languages: [cs, da, de, es, fi, fr, it, ja, ko, nb, nl, pl, pt-BR, pt-PT, sv, th, tr, vi, zh-CN, zh-TW]
     audience: merchant
-    scheme: 'online-store-theme'
+    scheme: 'apps-and-themes'
     owners: ['@Shopify/themes-translations']
     paths:
       - locales/{{language}}.schema.json