fix: add payload checks in test

    #Agent checks, with local=true, that the entity is created in A

    ${response}=    Retrieve Entity    ${entity_id}    local=true    broker_url=${b1_url}

    Should Be Equal    ${response.json()}    ${entity_payload_filename}

    Check Response Status Code    200    ${response.status_code}

    #Agent checks, with local=true, that the entity was not created in B

    ${response}=    Retrieve Entity    ${entity_id}    local=true    broker_url=${b2_url}

    Check Response Status Code    404    ${response.status_code}

    #Agent checks, with local=true, that the entity is created in C

    ${response}=    Retrieve Entity    ${entity_id}    local=true    broker_url=${b3_url}

    Check Response Status Code    200    ${response.status_code}

    Should Be Equal    ${response.json()}    ${entity_payload_filename}

    #Agent checks, with local=true, that the entity is created in D and only contains the properties availableSpotsNumber and totalSpotsNumber

    ${response}=    Retrieve Entity    ${entity_id}    local=true    broker_url=${b4_url}