chore(testing): make ContextForge benchmarks reproducible and CI-friendly #5920

Job	Run time
Rust-enabled container smoke	10m 47s
Container Smoke (python-sandbox)	52s
Container Smoke (a2a-echo-agent)	46s
Security Scan	2m 36s
Container Smoke (main)	1m 54s
	16m 55s

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