feat(testing): enhance Bruno collection with library automation

Add environment variable persistence for library and folder IDs in
Bruno API collection scripts. Create Library and Add Library Folder
endpoints now automatically save their respective IDs to the
environment for use in subsequent requests.

bruno/library/Create Library.yml

@@ -6,9 +6,6 @@ info:
 http:
   method: POST
   url: "{{base_url}}/api/libraries"
-  headers:
-    - name: ""
-      value: application/json
   body:
     type: json
     data: |-