Config scripts for ASQL Mirrored database ELT pattern

[bennyaustin]

This pull request introduces support for ingesting and transforming data from an Azure SQL Mirror source system ("WWI-mirror") into the ELT pipeline. It adds new post-deployment scripts and updates existing indexes and deployment logic to accommodate the new data source. The changes also generalize some transformation compute names and update index definitions to include the OutputDWTable column for uniqueness.

Azure SQL Mirror integration:

• Added a new ASQLMirror folder and three post-deployment scripts: ASQLMirror_IngestDefinition.sql, ASQLMirror_L1TransformDefinition.sql, and ASQLMirror_L2TransformDefinition.sql, which define ingestion and transformation logic for mirrored Azure SQL tables and ensure idempotent (re-runnable) deployment using MERGE statements. [1] [2] [3] [4] [5]
• Updated the main post-deployment script (Script.PostDeployment.sql) to include and execute the new ASQLMirror scripts, enabling their automatic application during deployments.

Index and schema updates:

• Modified unique index definitions for L1TransformDefinition, L1TransformInstance, L2TransformDefinition, and L2TransformInstance to include the OutputDWTable column, ensuring uniqueness when multiple output tables are involved. [1] [2] [3] [4]

Generalization and consistency improvements:

• Changed the compute name for L1 transforms in RestAPI and UploadFiles sources from 'L1Transform-Generic-Synapse' to 'L1Transform-Generic-Fabric' and set ComputePath to NULL for consistency with new patterns. [1] [2] [3]