Unfriend reactor from timer #117

Job	Run time
Test with DPDK enabled / test	22m 5s
Test with C++20 modules enabled / test	10m 54s
Test (clang++, C++20, debug) / test	14m 58s
Test (clang++, C++20, dev) / test	13m 11s
Test (clang++, C++20, release) / test	15m 33s
Test (clang++, C++23, debug) / test	15m 54s
Test (clang++, C++23, release) / test	15m 50s
Test (clang++, C++23, dev) / test	13m 6s
Test (g++, C++20, debug) / test	18m 11s
Test (g++, C++20, dev) / test	11m 52s
Test (g++, C++20, release) / test	16m 23s
Test (g++, C++23, debug) / test	19m 37s
Test (g++, C++23, dev) / test	11m 38s
Test (g++, C++23, release) / test	16m 24s
	3h 35m 36s

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