Related to: https://github.com/fleetdm/fleet/issues/33266
Changes:
- Added a new helper
`sails.helpers.androidProxy.getIsEnterpriseManagedByFleet`. This helper
returns `true` if a provided Android Enterprise ID is present in the
list of all Android Enterprises managed by Fleet, or `false` if it is
not in the list.
- Updated `create-android-enrollment-token`,
`create-android-signup-url`, and `modify-android-policies` to return a
404 response to the requesting Fleet instance if their Android
Enterprise is not managed by Fleet.
