Generate 2025-04 admin extensions docs (#3971)

* Remove packages/ui-extensions/docs/**/generated from .gitignore

* add packages/ui-extensions/docs/**/generated/**/*.json to .prettierignore

* add generated docs for admin UI extensions 2025-04

Author: billfienberg

.prettierignore

@@ -1,4 +1,4 @@
 node_modules
 packages/*/build
 packages/web-pixels-extension/src/schemas/pixel-events.jtd.json
-packages/ui-extensions/docs/**/generated/**/*.json
+packages/ui-extensions/docs/**/generated/**/*.json