Test

Make total_steal_time() monotonic. #6

Job	Run time
Test with C++20 modules enabled / test	11m 31s
Test (clang++, C++20, dev) / test	14m 37s
Test (clang++, C++20, debug) / test	14m 47s
Test with DPDK enabled / test	22m 7s
Test (clang++, C++20, release) / test	14m 30s
Test (clang++, C++23, debug) / test	15m 27s
Test (clang++, C++23, dev) / test	14m 47s
Test (clang++, C++23, release) / test	15m 23s
Test (g++, C++20, debug) / test	19m 15s
Test (g++, C++20, dev) / test	11m 46s
Test (g++, C++20, release) / test	15m 58s
Test (g++, C++23, debug) / test	18m 15s
Test (g++, C++23, dev) / test	12m 17s
Test (g++, C++23, release) / test	16m 31s
	3h 37m 11s

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