[2.3.0] Checkmk Werk 16496 created: agent_azure: fix parsing loadbalancer data

[//]: # (werk v2) # agent_azure: fix parsing loadbalancer data key | value ---------- | --- date | 2024-03-06T15:46:21+00:00 version | 2.3.0b3 class | fix edition | cre component | checks level | 1 compatible | yes The agent would crash if information (backend pools or outbound rules) was missing for a load balancer. This werk ensures that the system handles scenarios where this data may not be present.