only include policies in device endpoints for premium users

[roperzh]

This removes policy information from GET /api/_version_/fleet/device/{token} from non-premium Fleet instances.

Starting the server with ./build/fleet serve --dev --dev_license

$ curl -s https://localhost:8080/api/latest/fleet/device/1804e808-171f-4dda-9bec-f695b2f2371a | jq '.host.policies // "not present"'
[
  {
    "id": 3,
    "name": "Antivirus healthy (Linux)",
    "query": "SELECT score FROM (SELECT case when COUNT(*) = 2 then 1 ELSE 0 END AS score FROM processes WHERE (name = 'clamd') OR (name = 'freshclam')) WHERE score == 1;",
    "description": "Checks that both ClamAV's daemon and its updater service (freshclam) are running.",
    "author_id": 1,
    "author_name": "Roberto",
    "author_email": "test@example.com",
    "team_id": null,
    "resolution": "Ensure ClamAV and Freshclam are installed and running.",
    "platform": "darwin,linux",
    "created_at": "2022-05-23T20:53:36Z",
    "updated_at": "2022-06-03T13:17:42Z",
    "response": ""
  }
]

Starting the server with ./build/fleet serve --dev

$ curl -s https://localhost:8080/api/latest/fleet/device/1804e808-171f-4dda-9bec-f695b2f2371a | jq '.host.policies // "not present"'
"not present"

This doesn't break the UI (I also manually tested) because a license check is used before trying to display any data (nice!)

fleet/frontend/pages/hosts/details/DeviceUserPage/DeviceUserPage.tsx

Lines 281 to 289 in 3290eb5

	{isPremiumTier && (
	<TabPanel>
	<PoliciesCard
	policies={host?.policies || []}
	isLoading={isLoadingHost}
	deviceUser
	togglePolicyDetailsModal={togglePolicyDetailsModal}
	/>
	</TabPanel>

cc: @gillespi314 do you think this makes sense?

Related to: #5806

Checklist for submitter

If some of the following don't apply, delete the relevant line.

• Changes file added for user-visible changes (in changes/ and/or orbit/changes/).
• Added/updated tests
• Manual QA for all new/changed functionality

[codecov-commenter]

Codecov Report

Merging #6077 (312480d) into main (842ebbb) will increase coverage by 0.00%.
The diff coverage is 85.18%.

@@           Coverage Diff           @@
##             main    #6077   +/-   ##
=======================================
  Coverage   59.16%   59.17%           
=======================================
  Files         366      366           
  Lines       33972    33986   +14     
=======================================
+ Hits        20101    20112   +11     
- Misses      11839    11846    +7     
+ Partials     2032     2028    -4     

Impacted Files	Coverage Δ
orbit/cmd/orbit/orbit.go	1.64% <ø> (+<0.01%)	⬆️
server/fleet/hosts.go	71.15% <ø> (ø)
server/service/hosts.go	70.65% <81.81%> (+0.46%)	⬆️
server/service/devices.go	57.40% <100.00%> (+1.63%)	⬆️
server/vulnerabilities/sync.go	58.00% <0.00%> (-2.41%)	⬇️

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