DOC-3239: Port ai proxy update to v6 branch. (#3783)

Author: kemister85

antora.yml

@@ -15,7 +15,7 @@ asciidoc:
     webcomponent_url: https://cdn.jsdelivr.net/npm/@tinymce/tinymce-webcomponent@2/dist/tinymce-webcomponent.min.js
     jquery_url: https://cdn.jsdelivr.net/npm/@tinymce/tinymce-jquery@2/dist/tinymce-jquery.min.js
     openai_proxy_url: https://openai.ai-demo-proxy.tiny.cloud/v1/chat/completions
-    openai_proxy_token: eyJhbGciOiJFUzM4NCJ9.eyJhdWQiOlsiaHR0cHM6Ly9vcGVuYWkuYWktZGVtby1wcm94eS50aW55LmNsb3VkLyJdLCJleHAiOjE3NTEzMjgwMDAsImh0dHBzOi8vb3BlbmFpLmFpLWRlbW8tcHJveHkudGlueS5jbG91ZC9yb2xlIjoicHVibGljLWRlbW8iLCJpc3MiOiJodHRwczovL2FpLWRlbW8tcHJveHkudGlueS5jbG91ZC8iLCJqdGkiOiJmOGFmY2EyNC1mN2FhLTQxMjktYTc2Yy02YThlZDU3YjAyZjYiLCJzdWIiOiJhaS1hc3Npc3RhbnQtZGVtbyJ9.Xu0apHCbxgmRQTeTqrTIDFFhh2CgKeARRXa3mCxSGoCwZqkoQaFRZBCzDo8Xz7DuUa5mW2XHl-HYcYiXJM9ly16d0oY7lJefHBeLlmJEBE1CSttHBkCRWZS8eFLCasL6
+    openai_proxy_token: eyJhbGciOiJFUzM4NCJ9.eyJhdWQiOlsiaHR0cHM6Ly9vcGVuYWkuYWktZGVtby1wcm94eS50aW55LmNsb3VkLyJdLCJleHAiOjE3ODI4NjQwMDAsImh0dHBzOi8vb3BlbmFpLmFpLWRlbW8tcHJveHkudGlueS5jbG91ZC9yb2xlIjoicHVibGljLWRlbW8iLCJpc3MiOiJodHRwczovL2FpLWRlbW8tcHJveHkudGlueS5jbG91ZC8iLCJqdGkiOiIxZWY3NjJiNi1mZDYyLTQ3ZWQtOGRkNS0yOGRmMzBkZDU4YmMiLCJzdWIiOiJhaS1hc3Npc3RhbnQtZGVtbyJ9.WC8GIY19MgZneDVZoA-Ttt9E7gNkD0Yl-pcM_5c2RT3RdV_zE0i4bPOGBJpg_g6wu_4ki2ery6_JZtk2Q9gXEBHH7fIu7hXDFS8uIV9qe8MyxEqqRncGFVDjSTldVXGS
     default_meta_keywords: tinymce, documentation, docs, plugins, customizable skins, configuration, examples, html, php, java, javascript, image editor, inline editor, distraction-free editor, classic editor, wysiwyg
     # product variables
     productname: TinyMCE