For consistency with new MFA email in #22078.
# Checklist for submitter
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`.
See [Changes
files](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/Committing-Changes.md#changes-files)
for more information.
- [x] Manual QA for all new/changed functionality
relates to #21559
This adds the ability for end users to enrol their own device in fleet
mdm.
> NOTE: this new byod HTML page is a separate HTML asset that contains
all styles and scripts needed for the page to work. We do not send the
fleet UI assets and this drastically cuts down the response time to the
users who will be visiting this page on mobile devices
There are two sides included in this:
**Adding a new add host modal ios and iPad section for IT admins**

**delivering a new byod HTML page to end users that will allow end users
to download the config profile to enrol into fleet mdm**

<!-- 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`.
See [Changes
files](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/Committing-Changes.md#changes-files)
for more information.
- [ ] Added/updated tests
- [x] Manual QA for all new/changed functionality
relates to #17417
implements UI changes for updating os versions with ddm. This is just
changing the nudge preview
also cleans up some older code on the OS updates page.
**new nudge preview:**

- [x] Changes file added for user-visible changes in `changes/` or
`orbit/changes/`.
- [x] Manual QA for all new/changed functionality
* add awaitng results state to live query search
* make spinner more reusable and add it to query page awaiting results
* create common QueryResultsHeader component to use on query policy flows
* create a MainContent and SidePanelContent containers for layout
this creates these two new components for handling layout more cleanly. It also allows us to put in common components into main layout, like sandbox expiration notification
* use MainContent and SidePanelContent in current pages
this brings in the two new components and wraps the page contents in these. This also allowed us to clean up and remove unused/no needed styling code
* add MainContent component to user settings page and clean up user settings component
this cleans up the user settings page to follow the panel convention we have as well as adds the MainContent component to this page
* add MainContent component to team pages
* update Sandbox gate to render optional component when in sandbox mode and add to MainContent
* add call to sandbox api to get expiry time
this adds a conditional call when the user is in sandbox mode to get the expiry time of the instance
* fix sticky elements on settings pages to work with sandbox expiry message
* fix e2e test after MainContent refactor