Refactor gitlab ci configs so that mac and cray jobs can reuse as much higher level
configuration as possible.
* CI: remove redundant sections
* CI: Include base linux CI configs in cray stacks
Relocation and runner mapping is consistent between cray and linux runners.
* Export user cache path in before script
* CI: add GPG root for mac runners
* Disable user configs
Metal runners share a ~ directory
* Disable user config and add configs in activate env
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