chore(testing): remove obsolete Bruno collection folder configurations

Remove unused folder.yml configuration files from media-items filters
and search collections as part of ongoing API collection cleanup.

bruno/media-items/filters/folder.yml

@@ -1,7 +0,0 @@
-info:
-  name: filters
-  type: folder
-  seq: 7
-
-request:
-  auth: inherit

bruno/media-items/search/folder.yml

@@ -1,6 +0,0 @@
-info:
-  name: search
-  type: folder
-  seq: 6
-
-request: {}