Add comprehensive performance testing and load testing CI pipeline

Performance Testing Pipeline

Adds long-running CI jobs for realistic bottleneck analysis:

Long-Running Jobs:

• Performance profiling with JProfiler: 240s
• Security pen testing with OWASP ZAP: 200s
• Load testing with k6: 180s
• Integration test suite: 150s
• Database migration tests: 120s

Total pipeline time: ~15 minutes

This enables knowledge graph queries for:

• CI/CD bottleneck identification
• Pipeline optimization opportunities
• Resource allocation planning