Werk #15434: agent: return better respones for GET collection

Component	REST API
Title	agent: return better respones for GET collection
Date	Mar 8, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.2.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0p25 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Previously when calling the agent GET collection endpoint, the value attribute would only contain the following information for each agent

{
    "domainType": "dict",
    "title": "e660531752c87c6c"
}

It now contains the following

{
    'domainType': 'agent',
    'extensions': {},
    'id': 'a3e050556d2455c2',
    'links': [
        {
            'domainType': 'link',
            'href': 'http://localhost/heute/check_mk/api/1.0/objects/agent/a3e050556d2455c2',
            'method': 'GET',
            'rel': 'self',
            'type': 'application/json'
        }
    ],
    'members': {},
    'title': 'Agent a3e050556d2455c2'
}

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