Changes Feedstock Output Validation Procedure

We have changed our feedstock output validation procedure. Instead of automatically adding new packages to existing feedstocks (e.g., when a new output is added), we will now require that maintainers submit a PR to add the new output via our admin-requests repository. New feedstocks created via staged-recipes will have their outputs added automatically. If you maintain a feedstock that regularly adds new outputs (e.g., llvmdev has libllvm18, libllvm19, etc.), we have created a list of feedstocks with allowed glob patterns. These feedstocks will have any outputs matching their glob patterns added automatically. If you would like to add your feedstock to this list, please submit a PR. Further details on package output validation cna be found in our documentation.