VP8: do not forward RTP packets which payload contains a higher temporal layer than current one. #4839

Job	Run time
ci (ubuntu-20.04, 18, gcc, g++, Release)	6m 34s
ci (ubuntu-20.04, 18, gcc, g++, Debug)	8m 5s
ci (ubuntu-22.04, 20, gcc, g++, Release)	5m 46s
ci (ubuntu-22.04, 20, gcc, g++, Debug)	5m 14s
ci (ubuntu-22.04, 22, gcc, g++, Release)	6m 4s
ci (ubuntu-22.04, 22, gcc, g++, Debug)	7m 22s
ci (ubuntu-24.04, 22, gcc, g++, -Db_sanitize=address, Release)	8m 56s
ci (ubuntu-24.04, 22, gcc, g++, -Db_sanitize=address, Debug)	6m 32s
ci (ubuntu-24.04, 22, clang, clang++, -Db_sanitize=undefined, Release)	9m 44s
ci (ubuntu-24.04, 22, clang, clang++, -Db_sanitize=undefined, Debug)	9m 51s
ci (ubuntu-24.04, 22, gcc, g++, -Db_sanitize=thread, Release)	7m 19s
ci (ubuntu-24.04, 22, gcc, g++, -Db_sanitize=thread, Debug)	6m 29s
ci (macos-13, 18, clang, clang++, Release)	10m 28s
ci (macos-13, 18, clang, clang++, Debug)	11m 5s
ci (macos-14, 20, clang, clang++, Release)	6m 16s
ci (macos-14, 20, clang, clang++, Debug)	4m 32s
ci (macos-15, 22, clang, clang++, Release)	4m 27s
ci (macos-15, 22, clang, clang++, Debug)	7m 16s
ci (windows-2022, 20, cl, cl, Release)	9m 35s
ci (windows-2022, 20, cl, cl, Debug)	8m 14s
ci (windows-2022, 22, cl, cl, Release)	8m 51s
ci (windows-2022, 22, cl, cl, Debug)	7m 53s
	2h 46m 33s

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