add unit test for mapping packets with lower sequence number than the first mapped packet #4770

Job	Run time
ci (ubuntu-20.04, 18, Release)	6m 32s
ci (ubuntu-20.04, 18, Debug)	8m 24s
ci (ubuntu-22.04, 20, Release)	5m 34s
ci (ubuntu-22.04, 20, Debug)	7m 50s
ci (ubuntu-22.04, 22, Release)	5m 47s
ci (ubuntu-22.04, 22, Debug)	5m 11s
ci (ubuntu-24.04, 22, -Db_sanitize=address, Release)	8m 38s
ci (ubuntu-24.04, 22, -Db_sanitize=address, Debug)	8m 15s
ci (ubuntu-24.04, 22, -Db_sanitize=undefined, Release)	9m 16s
ci (ubuntu-24.04, 22, -Db_sanitize=undefined, Debug)	6m 31s
ci (ubuntu-24.04, 22, -Db_sanitize=thread, Release)	7m 19s
ci (ubuntu-24.04, 22, -Db_sanitize=thread, Debug)	6m 1s
ci (macos-12, 18, Release)	9m 46s
ci (macos-12, 18, Debug)	6m 13s
ci (macos-14, 20, Release)	4m 29s
ci (macos-14, 20, Debug)	5m 52s
ci (macos-14, 22, Release)	4m 34s
ci (macos-14, 22, Debug)	3m 34s
ci (windows-2022, 20, Release)	7m 59s
ci (windows-2022, 20, Debug)	7m 21s
ci (windows-2022, 22, Release)	8m 15s
ci (windows-2022, 22, Debug)	7m 16s
	2h 30m 37s

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