fix:Example validation fixes

[lgallard]

Summary

This PR addresses issues #160 and #162 by fixing validation errors in the cost_optimized_backup example that were discovered during testing.

Issues Resolved

• 🐛 Unsupported Argument: notifications parameter in cross_region_backup example #160: ✅ Unsupported notifications parameter in cross_region_backup example (already fixed in commit 18a163f)
• 🐛 Invalid Lifecycle Configuration: cost_optimized_backup example has conflicting cold storage settings #162: ✅ Invalid lifecycle configuration in cost_optimized_backup example (already fixed in commit 18a163f)

Additional Fix Applied

Fixed incorrect module output references in examples/cost_optimized_backup/outputs.tf that were causing terraform validate failures:

Changes Made:

• ✅ backup_vault_arn → vault_arn
• ✅ backup_vault_id → vault_id
• ✅ backup_plan_arns[key] → plans[key].arn
• ✅ backup_plan_ids[key] → plans[key].id
• ✅ backup_role_arn → plan_role
• ✅ Removed unsupported backup_selection_ids output

Validation Results

Both examples now pass validation:

# cross_region_backup
terraform validate
✅ Success! The configuration is valid.

# cost_optimized_backup  
terraform validate
✅ Success! The configuration is valid.

Test Plan

• Validated cross_region_backup example passes terraform validate
• Validated cost_optimized_backup example passes terraform validate
• Ensured all output references match actual module outputs
• Verified terraform fmt passes on all files
• Confirmed no breaking changes to module interface

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

🤖 Generated with Claude Code

[lgallard]

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