Map rules to NIST 800-53 Audit and Accountability (AU) family

Update AU family control files for rhel8, rhel9, and rhel10 with
automated rule mappings. Map existing rules with NIST references
to 28 AU controls covering audit generation, storage, review,
and protection.

Changes:
- Updated 28 controls from 'pending' to 'automated' status
- Added rule mappings for controls au-2 through au-14
- Includes mappings for enhancements (e.g., au-3.1, au-4.1, au-12.1)
- Consistent mappings across rhel8, rhel9, and rhel10

Notable mappings:
- au-2: Event logging (67 audit rules)
- au-3: Content of audit records (35 rules)
- au-12: Audit record generation (67 rules)
- au-9: Protection of audit information (15 rules)

Author: ggbecker