Webhooks: $COMPANY_NAME variable for Central KB/Global

When setting up webhooks that use the $COMPANY_NAME variable, actions that occur in the Central KB currently just display the variable name itself, since there’s no associated company.

It would be helpful to have support for conditional logic that displays something like "Central KB" or "Global" when $COMPANY_NAME is null. This would better reflect the actual context for assets not tied to a specific company.