Werk #15435: password: return better responses for GET collection

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

{
    "domainType": "dict",
    "title": "Kubernetes login"
}

It now contains links + the expected password information.

{
    'domainType': 'password',
    'extensions': {
        'comment': 'comment1\n',
        'documentation_url': '',
        'owned_by': None,
        'shared': ['all']
        },
    'id': 'password_1',
    'links': [
        {
            'domainType': 'link',
            'href': 'http://localhost/heute/check_mk/api/1.0/objects/password/password_1',
            'method': 'GET',
            'rel': 'self',
            'type': 'application/json'
        },
        {
            'domainType': 'link',
            'href': 'http://localhost/heute/check_mk/api/1.0/objects/password/password_1',
            'method': 'PUT',
            'rel': 'urn:org.restfulobjects:rels/update',
            'type': 'application/json'
        },
        {
            'domainType': 'link',
            'href': 'http://localhost/heute/check_mk/api/1.0/objects/password/password_1',
            'method': 'DELETE',
            'rel': 'urn:org.restfulobjects:rels/delete',
            'type': 'application/json'}
    ],
    'members': {
        'title': {
            'format': 'string',
            'id': 'title',
            'links': [
                {
                    'domainType': 'link',
                    'href': 'http://localhost/heute/check_mk/api/1.0/objects/password/password_1/properties/title',
                    'method': 'GET',
                    'rel': 'self',
                    'type': 'application/json'}
            ],
            'memberType': 'property',
            'title': None,
            'value': 'pw1'
        }
    },
    'title': 'pw1'
}

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