swatch-2084: update eventController to set the azure billingAccountId

[kflahert]

Jira issue: SWATCH-2084

Description

Need to set the billingAccountId for azure events by using the fields azure_tenant_id and azure_subscription_id from cost-mgmt.

Testing

Setup

1. Start app w/: DEV_MODE=true ./gradlew :bootRun

Steps

1. Put message on topic platform.rhsm-subscriptions.service-instance-ingress:
   {"sla": "Premium", "role": "Red Hat Enterprise Linux Server", "usage": "Production", "org_id": "org_123", "event_id": "3d363cc8-b2bc-4230-a943-638a4822da70", "timestamp": "2024-01-21T22:00:00Z", "event_type": "snapshot", "expiration": "2024-01-21T23:00:00Z", "instance_id": "test", "product_ids": ["69", "204"], "product_tag": ["rhel-for-x86-els-payg"], "event_source": "cost-management", "measurements": [{"uom": "vCPUs", "value": 1.0}], "service_type": "RHEL System", "hardware_type": "Cloud", "cloud_provider": "Azure", "azure_tenant_id": "testTenantId", "billing_provider": "azure", "azure_subscription_id": "testSubscriptionId"}

Verification

1. Check event for billing_account_id = "testTenantId;testSubscriptionId":
   select * from events where org_id = 'org_123';

[TrayvonMcKnight]

The kafka message was able to be processed and resulted in the the entry below.

https://docs.google.com/document/d/1YEnOVphMAjskVWQh-g_WNav47FLtRABhNM0gOnxrRRA/edit?usp=sharing

[Sgitario]

just a minor suggestion, otherwise lgtm!