Enable permanent storage for use fixes

[brianmcgillion]

This is for storing some of the user common directories that are under the users home directory.

Description of changes

This makes some of the directories persist across the reboots.

Checklist for things done

• Summary of the proposed changes in the PR description
• More detailed description in the commit message(s)
• Commits are squashed into relevant entities - avoid a lot of minimal dev time commits in the PR
• Contribution guidelines followed
• Ghaf documentation updated with the commit - https://tiiuae.github.io/ghaf/
• PR linked to architecture documentation and requirement(s) (ticket id)
• Test procedure described (or includes tests). Select one or more:
  • Tested on Lenovo X1 x86_64
  • Tested on Jetson Orin NX or AGX aarch64
  • Tested on Polarfire riscv64
• Author has run make-checks and it passes
• All automatic Github Action checks pass - see actions
• Author has added reviewers and removed PR draft status
• Change requires full re-installation
• Change can be updated with nixos-rebuild ... switch

Instructions for Testing

• List all targets that this applies to:
  lenovo-x1 MVP target

• If it is an improvement how does it impact existing functionality?

• this adds some of the appvm user directories to the permanent storage.

ssh chromium-vm or business-vm
echo "hello downloads" > Downloads/downloads.txt
echo "hello documents" > Documents/documents.txt

reboot

ssh chromium-vm or business-vm
cat Downloads/downloads.txt
cat Documents/documents.txt