Use UCX on Narwhal, skip ~/.spack logic for macOS, delete CI workfl…

…ows on R&D cluster and macOS Intel (#1033)

Provide instructions for loading Cray UCX module instead of OFI module at runtime on Narwhal for better performance.
Revert node.js workaround on Narwhal. Requires Bug fix for py-jupyter-server and hidden npm/node dependency spack#417. This also fixed the build error reported on macOS.
Skip recent change to ignore ~/.spack on macOS to avoid annoying error messages
Delete CI workflows on JCSDA R&D cluster and macOS Intel (both turned off)
Bug fix in configs/common/modules_*.yaml: need protobuf and py-protobuf modules for cylc-jupyter server to work

configs/common/modules_lmod.yaml

@@ -71,8 +71,6 @@ modules:
       - openssl
       - perl
       - pkgconf
-      - protobuf
-      - py-protobuf
       - qt
       - randrproto
       - readline

configs/common/modules_tcl.yaml

@@ -73,8 +73,6 @@ modules:
       - openssl
       - perl
       - pkgconf
-      - protobuf
-      - py-protobuf
       - qt
       - randrproto
       - readline