Set `security.nesting=true` for LXD projects

[mr-cal]

What needs to get done

• set security.nesting=true in the LXD project profile
• determine which versions of systemd are affected and which LXD images will need this set

Why it needs to get done

Newer versions of systemd does not work well in nested containers.

This needs to be fixed at least for Oracular images.

Source:

• https://github.com/canonical/lxd/issues/13631
• https://matrix.to/#/!NPPCseDHKRvSBMUEXN:ubuntu.com/$l9-msw901I7b885eH4LaGs_T9gmLKbSqE8tVrGLnAAk?via=ubuntu.com&via=matrix.org

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The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-3096.

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