Refactor DMG creation process in build workflow
* Update the OrcaSlicer DMG creation steps to exclude the profile validator helper from the main DMG.
* Introduce a dedicated directory for the main OrcaSlicer DMG and the profile validator DMG, ensuring a cleaner build process.
* Use symbolic links with the `-sfn` option to avoid issues with existing links.
This change enhances the organization of the build artifacts and improves the clarity of the DMG creation process.
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