add unit test for mapping packets with lower sequence number than the first mapped packet #4747

Job	Run time
ci (ubuntu-20.04, gcc, g++, true, 22, Release)	16s
ci (ubuntu-20.04, gcc, g++, true, 22, Debug)	27s
ci (ubuntu-20.04, clang, clang++, true, 22, Release)	13s
ci (ubuntu-20.04, clang, clang++, true, 22, Debug)	18s
ci (ubuntu-22.04, gcc, g++, 22, Release)	14s
ci (ubuntu-22.04, gcc, g++, 22, Debug)	11s
ci (ubuntu-22.04, clang, clang++, 22, Release)	14s
ci (ubuntu-22.04, clang, clang++, 22, Debug)	12s
ci (macos-12, gcc, g++, 22, Release)	23s
ci (macos-12, gcc, g++, 22, Debug)	24s
ci (macos-14, clang, clang++, 22, Release)	19s
ci (macos-14, clang, clang++, 22, Debug)	24s
ci (windows-2022, cl, cl, 22, Release)	2m 34s
ci (windows-2022, cl, cl, 22, Debug)	2m 32s
	8m 41s

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