conda_forge_yml.rst: Rework upload_packages option
conda_forge_yml.rst: Rework upload_packages option

`upload_packages` is now supported across CI services, azure now
defaults to uploading packages.

conda-forge/conda-forge.github.io,conda-forge/conda-forge.github.io,conda-forge/conda-forge.github.io,conda-forge/conda-forge.github.io