Test

Make total_steal_time() monotonic. #35

Job	Run time
Test (clang++, C++20, dev) / test	4m 43s
Test with DPDK enabled / test	11m 20s
Test with C++20 modules enabled / test	12m 16s
Test (clang++, C++20, debug) / test	7m 51s
Test (clang++, C++20, release) / test	5m 53s
Test (clang++, C++23, debug) / test	7m 59s
Test (clang++, C++23, dev) / test	4m 28s
Test (clang++, C++23, release) / test	15m 44s
Test (g++, C++20, debug) / test	8m 49s
Test (g++, C++20, dev) / test	5m 3s
Test (g++, C++20, release) / test	5m 2s
Test (g++, C++23, debug) / test	9m 23s
Test (g++, C++23, dev) / test	4m 33s
Test (g++, C++23, release) / test	5m 25s
	1h 48m 29s

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