VP8: do not forward RTP packets which payload contains a higher temporal layer than current one. #4820

Job	Run time
ci (ubuntu-20.04, gcc, g++, true, true, false, true, 22, Release)	23m 3s
ci (ubuntu-20.04, gcc, g++, true, true, false, true, 22, Debug)	21m 32s
ci (ubuntu-20.04, clang, clang++, true, true, true, true, 22, Release)	30m 15s
ci (ubuntu-20.04, clang, clang++, true, true, true, true, 22, Debug)	25m 35s
ci (ubuntu-22.04, gcc, g++, true, false, true, 22, Release)	21m 16s
ci (ubuntu-22.04, gcc, g++, true, false, true, 22, Debug)	18m 35s
ci (ubuntu-22.04, clang, clang++, true, true, true, 22, Release)	31m 29s
ci (ubuntu-22.04, clang, clang++, true, true, true, 22, Debug)	26m 46s
ci (ubuntu-24.04, gcc, g++, true, true, false, true, 22, Release)	23m 45s
ci (ubuntu-24.04, gcc, g++, true, true, false, true, 22, Debug)	20m 56s
ci (ubuntu-24.04, clang, clang++, true, true, true, true, 22, Release)	33m 29s
ci (ubuntu-24.04, clang, clang++, true, true, true, true, 22, Debug)	29m 49s
ci (macos-13, gcc, g++, true, false, false, false, 22, Release)	11m 40s
ci (macos-13, gcc, g++, true, false, false, false, 22, Debug)	11m 47s
ci (macos-14, clang, clang++, true, false, false, false, 22, Release)	6m 20s
ci (macos-14, clang, clang++, true, false, false, false, 22, Debug)	4m 4s
ci (macos-15, clang, clang++, true, false, false, false, 22, Release)	4m 43s
ci (macos-15, clang, clang++, true, false, false, false, 22, Debug)	6m 15s
ci (windows-2022, cl, cl, false, false, false, 22, Release)	8m 0s
ci (windows-2022, cl, cl, false, false, false, 22, Debug)	6m 30s
	6h 5m 49s

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