add agent and RC resiliency testing to FFE #5723
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Add comprehensive resilience tests for Feature Flag Evaluation (FFE) to verify behavior when Remote Configuration (RC) and agent services become unavailable: 1. **RC Resilience Test**: Uses network delays (5-second timeout) to simulate RC service being down/unreachable and verifies FFE continues working with cached configurations. 2. **Agent Resilience Test**: Uses network delays (8-second timeout) to simulate agent connectivity issues while preserving library cache, then verifies FFE works with local cached configurations. 3. **Recovery Test**: Tests complete RC recovery cycle with service restoration and new configuration updates. Key improvements: - Uses network delays for both RC and agent failure simulation in parametric tests - Preserves library cache during agent connectivity issues - Comprehensive error handling and cleanup procedures - Proper approach for parametric test architecture vs weblog tests - Clean imports and linting compliance Tests cover production failure scenarios including network issues, timeouts, and recovery cycles in the parametric test environment.
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