add unit test for mapping packets with lower sequence number than the first mapped packet #4748

Job	Run time
ci (ubuntu-20.04, gcc, g++, true, 22, Release)	15s
ci (ubuntu-20.04, gcc, g++, true, 22, Debug)	18s
ci (ubuntu-20.04, clang, clang++, true, 22, Release)	17s
ci (ubuntu-20.04, clang, clang++, true, 22, Debug)	14s
ci (ubuntu-22.04, gcc, g++, 22, Release)	13s
ci (ubuntu-22.04, gcc, g++, 22, Debug)	15s
ci (ubuntu-22.04, clang, clang++, 22, Release)	13s
ci (ubuntu-22.04, clang, clang++, 22, Debug)	14s
ci (macos-12, gcc, g++, 22, Release)	13s
ci (macos-12, gcc, g++, 22, Debug)	14s
ci (macos-14, clang, clang++, 22, Release)	12s
ci (macos-14, clang, clang++, 22, Debug)	16s
ci (windows-2022, cl, cl, 22, Release)	15s
ci (windows-2022, cl, cl, 22, Debug)	17s
	3m 26s

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