test: add regression for audit-stats counters (Closes #1558)

[laxjovial]

Pull Request Template

📝 Description

🎯 Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update
• Refactoring
• Performance improvement
• Security enhancement
• Other (please describe):

🔧 Changes Made

Files Modified

New Files Added

Key Changes

🧪 Testing

• Unit tests pass
• Integration tests pass
• Manual testing completed
• No breaking changes introduced
• Cross-platform compatibility verified
• Edge cases tested

Test Coverage

📋 Contract-Specific Checks

• Soroban contract builds successfully
• WASM compilation works
• Gas usage optimized
• Security considerations reviewed
• Events properly emitted
• Contract functions tested
• Error handling implemented
• Access control verified

Contract Testing Details

📋 Review Checklist

• Code follows project style guidelines
• Documentation updated if needed
• No sensitive data exposed
• Error handling implemented
• Edge cases considered
• Code is self-documenting
• No hardcoded values
• Proper logging implemented

🔍 Code Quality

• Clippy warnings addressed
• Code formatting follows rustfmt standards
• No unused imports or variables
• Functions are properly documented
• Complex logic is commented

🚀 Performance & Security

• Gas optimization reviewed
• No potential security vulnerabilities
• Input validation implemented
• Access controls properly configured
• No sensitive information in logs

📚 Documentation

• README updated if needed
• Code comments added for complex logic
• API documentation updated
• Changelog updated (if applicable)

🔗 Related Issues

Closes #1558

📋 Additional Notes

🧪 How to Test

📸 Screenshots (if applicable)

⚠️ Breaking Changes

🔄 Migration Steps (if applicable)

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