Remote compute provider support for scripts and actions

The CLI now supports running actions on remote compute providers. You can pass --remote and --compute (defaulting to microsandbox) with once run, once exec, and related Fabrik commands. Remote execution streams stdout and stderr back live when output is in human-readable format. This includes the embedded Microsandbox provider and the fix to package it correctly for Linux and Apple Silicon macOS release builds. (Intel macOS is not supported by this provider.)