Implement rollback functionality for MARS-956:

- Added script to delete exported CSV files from DATA bucket.
- Enhanced rollback file registrations script with improved error handling and success messages.
- Updated process logs cleanup script to include error handling and success messages.
- Modified rollback verification script for clearer success and warning messages.
- Removed outdated README.md file and updated installation script to reflect schema changes.
- Adjusted rollback master script to streamline execution steps and improve clarity.

MARS_Packages/REL02_POST/MARS-956/install_mars956.sql

@@ -1,7 +1,7 @@
 -- ===================================================================
 -- MARS-956 INSTALL SCRIPT: C2D MPEC Data Export to External Tables
 -- ===================================================================
--- Purpose: One-time bulk export of 3 C2D MPEC tables from OU_C2D schema
+-- Purpose: One-time bulk export of 3 C2D MPEC tables from OU_LEGACY_C2D schema
 --          to OCI buckets (ODS bucket CSV format)
 --          Uses DATA_EXPORTER v2.7.5 with pRegisterExport for file registration
 -- Author: System Generated
@@ -37,16 +37,14 @@ PROMPT
 PROMPT This script will export 3 C2D MPEC tables to OCI buckets:
 PROMPT 
 PROMPT TARGET: ODS Bucket (CSV format):
-PROMPT   - MPEC_ADMIN: 5 records with ETL keys 2001-2005
-PROMPT   - MPEC_CONTENT: 5 records with ETL keys 2006-2008
-PROMPT   - MPEC_CONTENT_CRITERION: 9 records with ETL keys 2009-2010
+PROMPT   - MPEC_ADMIN
+PROMPT   - MPEC_CONTENT
+PROMPT   - MPEC_CONTENT_CRITERION
 PROMPT 
 PROMPT Key Features:
 PROMPT   - Files registered in A_SOURCE_FILE_RECEIVED for tracking
 PROMPT   - Template table column order matching (CT_ET_TEMPLATES.C2D_MPEC_*)
 PROMPT   - ODS/C2D bucket path structure
-PROMPT 
-PROMPT Expected Duration: 2-5 minutes (small datasets)
 PROMPT =========================================================================
 
 -- Confirm installation with user