Add cluster.evacuate as instance and profile configuration

[edlerd]

Done

• Add cluster.evacuate as instance and profile configuration

Fixes #1078

QA

1. Run the LXD-UI:
   • On the demo server via the link posted by @webteam-app below. This is only available for PRs created by collaborators of the repo. Ask @mas-who or @edlerd for access.
   • With a local copy of this branch, build and run as described in the docs.
2. Perform the following QA steps:
   • check instance and profile configuration for create and edit.
   • ensure under migration the new option cluster evacuation is loading and saving fine.

[webteam-app]

Demo

Jenkins

demos.haus

[mas-who]

LGTM 👍 instance create/edits and profile inheritance all works nicely.