[Fleet] Gold License Denied Access to Set Per Policy Output

[Bearloggs]

Kibana version:
8.10.0

Elasticsearch version:
8.10.0

Server OS version:
Ubuntu 22.04.3 LTS Server

Browser version:
Firefox 118.0.1 (64-bit)

Browser OS version:
Ubuntu 22.04.3 LTS Desktop

Original install method (e.g. download page, yum, from source, etc.):
Official Elastic APT package

Describe the bug:
As it currently stands, users with a Gold license are erroneously being denied access to the Per Policy output configuration, even though this action should be permitted according to the license policies, if I'm not mistaken.

Steps to reproduce:

1. Access to Kibana with a Gold license and Fleet setup.
2. Create two Fleet outputs and set the first one as the default.
3. Utilize the DevTools console with the following request to assign the second output to a new agent policy:

POST kbn:/api/fleet/agent_policies
{
  "name": "test_agent_policy",
  "description": "Test Agent Policy",
  "namespace": "default",
  "data_output_id": "fleet-second-output",
  "monitoring_output_id": "fleet-second-output"
}

Example Result:

{
  "statusCode": 400,
  "error": "Bad Request",
  "message": "Invalid licence to set per policy output, you need platinum licence"
}

Expected behavior:
Gold license users should have the capability to set the Per Policy output, as per the documented licensing policies and expected functionality (https://www.elastic.co/subscriptions). However, the current implementation restricts this feature only to Platinum license users.

Screenshots:

Any additional context:
Related to PR: #126692

[elasticmachine]

Pinging @elastic/fleet (Team:Fleet)

[jen-huang]

We have the incorrect subscription level on that page, Platinum is now required for both of those features. Thanks for reporting, we will correct the information.