test: adding iterations in perf testing - #1625
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This PR changes
Serialized Execution: Runs the BqDriver and Core benchmarks sequentially instead of in parallel. This prevents API rate limiting and cross-interference against the same BigQuery project.
Multi-Iteration Median Sampling: Adds a benchmark_iterations parameter (defaults to 3). The results parser now reports the median of these runs to reject latency outliers and cold-cache spikes.
Process Isolation: Iterations are triggered via separate bash processes rather than --gtest_repeat. This prevents the Simba driver from crashing due to repeated DLL load/unload cycles.
Timeout Adjustment: Increased job timeout to 180 minutes to accommodate the extra iterations safely.
perf pipeline - link