add unit test for mapping packets with lower sequence number than the first mapped packet #4751

Job	Run time
ci (ubuntu-20.04, gcc, g++, true, 22, Release)	34m 56s
ci (ubuntu-20.04, gcc, g++, true, 22, Debug)	28m 3s
ci (ubuntu-20.04, clang, clang++, true, 22, Release)	29m 0s
ci (ubuntu-20.04, clang, clang++, true, 22, Debug)	25m 4s
ci (ubuntu-22.04, gcc, g++, 22, Release)	31m 40s
ci (ubuntu-22.04, gcc, g++, 22, Debug)	23m 6s
ci (ubuntu-22.04, clang, clang++, 22, Release)	31m 1s
ci (ubuntu-22.04, clang, clang++, 22, Debug)	27m 38s
ci (macos-12, gcc, g++, 22, Release)	8m 7s
ci (macos-12, gcc, g++, 22, Debug)	8m 13s
ci (macos-14, clang, clang++, 22, Release)	4m 49s
ci (macos-14, clang, clang++, 22, Debug)	5m 47s
ci (windows-2022, cl, cl, 22, Release)	7m 3s
ci (windows-2022, cl, cl, 22, Debug)	6m 29s
	4h 30m 56s

Provide feedback