For #25656
changed the copy for the delete and transfer host modal to be more clear
about the disk encryption key behaviour
**delete host modal**

**Transfer host modal**

If some of the following don't apply, delete the relevant line.
<!-- Note that API documentation changes are now addressed by the
product design team. -->
- [x] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
- [x ] Added/updated automated tests
- [x] Manual QA for all new/changed functionality