Context

In order to switch to invoice numbering generation via billing_entities, invoices should have billing_entity_sequential_id populated. that's why we're updating:

1. when generating invoice's organization_sequential_id, put the same value to the billing_entity_sequential_id
2. when switching on org from per_customer to per_organization, fulfil billing_entity_sequential_id as well as organization_sequential_id

Description

• Added job to fulfil billing_entity_sequential_id on invoices
• updated sequential_id generation to also fill billing_entity_sequential_id with the generated value
• updated service responsible for sequential_id generation when switching document numbering on organization