Mark web backend APIs as non-public (#9813)

Author: Tim Roes

airbyte-api/src/main/openapi/config.yaml

@@ -18,6 +18,7 @@ info:
     * All backwards incompatible changes will happen in major version bumps. We will not make backwards incompatible changes in minor version bumps. Examples of non-breaking changes (includes but not limited to...):
       * Adding fields to request or response bodies.
       * Adding new HTTP endpoints.
+    * All `web_backend` APIs are not considered public APIs and are not guaranteeing backwards compatibility.
 
   version: "1.0.0"
   title: Airbyte Configuration API
@@ -53,7 +54,9 @@ tags:
   - name: db_migration
     description: Database migration related resources.
   - name: web_backend
-    description: Connection between sources and destinations.
+    description: |
+      Endpoints for the Airbyte web application. Those APIs should not be called outside the web application implementation and are not
+      guaranteeing any backwards compatibility.
   - name: health
     description: Healthchecks
   - name: deployment

docs/reference/api/generated-api-html/index.html

@@ -200,6 +200,7 @@ <h1>Airbyte Configuration API</h1>
 <li>Adding new HTTP endpoints.</li>
 </ul>
 </li>
+<li>All <code>web_backend</code> APIs are not considered public APIs and are not guaranteeing backwards compatibility.</li>
 </ul>
 </div>
     <div class="app-desc">More information: <a href="https://openapi-generator.tech">https://openapi-generator.tech</a></div>