Enable host expiry (90 days) for Workstations and mobile device teams (#44650)

## Summary

- Enables host expiry settings for three teams by setting
`host_expiry_enabled: true` and `host_expiry_window: 90` (days) in each
team's GitOps configuration file.
- Hosts that have not checked in for 90 days will be automatically
removed from these teams' inventories.

## Changes

- `it-and-security/fleets/workstations.yml`: Updated
`host_expiry_settings` to enable expiry with a 90-day window.
- `it-and-security/fleets/company-owned-mobile-devices.yml`: Updated
`host_expiry_settings` to enable expiry with a 90-day window.
- `it-and-security/fleets/personal-mobile-devices.yml`: Updated
`host_expiry_settings` to enable expiry with a 90-day window.

## Teams affected

| Team | File | Window |
|------|------|--------|
| 💻 Workstations | `workstations.yml` | 90 days |
| 📱🏢 Employee-issued mobile devices | `company-owned-mobile-devices.yml`
| 90 days |
| 📱🔐 Personal mobile devices | `personal-mobile-devices.yml` | 90 days |

## Related

- Follows the same pattern as #44649 (Testing & QA team, 30 days).

---

Built for [Allen
Houchins](https://fleetdm.slack.com/archives/D0AFASNBZMW/p1777903880443949?thread_ts=1776095784.812489&cid=D0AFASNBZMW)
by [Kilo for Slack](https://kilo.ai/slack)

Co-authored-by: kiloconnect[bot] <240665456+kiloconnect[bot]@users.noreply.github.com>

it-and-security/fleets/company-owned-mobile-devices.yml

@@ -2,8 +2,8 @@ name: 📱🏢 Employee-issued mobile devices
 settings:
   features:
   host_expiry_settings:
-    host_expiry_enabled: false
-    host_expiry_window: 0
+    host_expiry_enabled: true
+    host_expiry_window: 90
   secrets:
     - secret: $DOGFOOD_COMPANY_OWNED_MOBILE_DEVICES_ENROLL_SECRET
   integrations:

it-and-security/fleets/personal-mobile-devices.yml

@@ -2,8 +2,8 @@ name: 📱🔐 Personal mobile devices
 settings:
   features:
   host_expiry_settings:
-    host_expiry_enabled: false
-    host_expiry_window: 0
+    host_expiry_enabled: true
+    host_expiry_window: 90
   secrets:
     - secret: $DOGFOOD_PERSONAL_MOBILE_DEVICES_ENROLL_SECRET
   integrations:

it-and-security/fleets/workstations.yml

@@ -9,8 +9,8 @@ settings:
     enable_host_users: true
     enable_software_inventory: true
   host_expiry_settings:
-    host_expiry_enabled: false
-    host_expiry_window: 0
+    host_expiry_enabled: true
+    host_expiry_window: 90
   secrets:
     - secret: $DOGFOOD_WORKSTATIONS_ENROLL_SECRET
   integrations: