AST 1205 adp to costpoint flow

Create ADP Employee to Costpoint Flow

Implement the main Prefect flow that orchestrates employee data sync from ADP to Costpoint using the connectors and mapping configuration.

Key details:

Create in workflows/adp_integration.py
Follow ETL pattern: load credentials → extract → transform → load
Load ADP and Costpoint credentials from AWS Secrets Manager (see TBD-09)
Pass credentials to connector instances
Use @task(retries=3) decorator for automatic retry logic
Use .map() for parallel employee processing
Use unmapped() for shared parameters in map operations
Handle partial failures: return error dict with {"error": str(e), "failed_at": "stage"}
Track success/failure counts for reporting
Create Prefect artifacts for observability
Accept parameters: customer_id, workflow_name, source_config, destination_config, mapping_block_name
See workflows/examples/pokemon_demo.py for reference pattern

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