Unified configuration documentation for 8.9

[mesellings]

Complete the unified configuration documentation begun in 8.8 and completed in 8.9

Related issue: https://github.com/camunda/product-hub/issues/3129

• Add property changes to 8.9 page in Self-Managed > Components > Orchestration Cluster > Property changes in 8.9
• Document new properties in Self-Managed > Components > Orchestration Cluster > Property reference