feat: Implement MARS-1409 post-hook for backfilling A_WORKFLOW_HISTORY_KEY

- Added .gitignore to exclude temporary folders.
- Created SQL script to update existing A_WORKFLOW_HISTORY_KEY in A_SOURCE_FILE_RECEIVED.
- Implemented rollback script to clear backfilled A_WORKFLOW_HISTORY_KEY values.
- Added README.md for installation and usage instructions.
- Developed master installation and rollback scripts for MARS-1409 post-hook.
- Verified installation and rollback processes with detailed checks.
- Updated trigger logic to manage workflow history updates.
- Ensured proper version tracking and verification for related packages.

MARS_Packages/REL02_POST/MARS-1409/rollback_version/A_WORKFLOW_HISTORY.sql

@@ -2,11 +2,6 @@ WHENEVER SQLERROR CONTINUE
 GRANT SELECT, INSERT, UPDATE, DELETE ON ct_ods.a_load_history TO ct_mrds;
 WHENEVER SQLERROR EXIT SQL.SQLCODE
 
--- Drop new trigger (MARS-1409 name) before restoring old trigger name
-WHENEVER SQLERROR CONTINUE
-drop TRIGGER ct_mrds.TRG_A_WORKFLOW_HISTORY;
-WHENEVER SQLERROR EXIT SQL.SQLCODE
-
 create or replace TRIGGER ct_mrds.a_workflow_history
 AFTER INSERT OR UPDATE OF workflow_successful ON ct_mrds.a_workflow_history
 REFERENCING NEW AS new OLD AS old