gtfsrt: support old way of track change communication (#412) #2048

Job	Run time
api-docs	15s
formatting	54s
rsl-ui-checks	40s
macos (macos-x86_64, macos-x86_64-avx)	1h 20m 20s
linux (linux-amd64-avx2-release, linux-amd64)	3m 12s
macos (macos-x86_64-noavx2, macos-x86_64-noavx, On)	24m 15s
linux (linux-amd64-noavx-release, linux-amd64-noavx)	3m 17s
macos (macos-arm64, macos-arm64)	13m 57s
linux (linux-x86-release, linux-x86)	3m 22s
linux (linux-arm-release, linux-arm, qemu-arm-static)	3m 35s
linux (linux-arm64-release, linux-arm64, qemu-aarch64-static)	3m 34s
linux (clang-tidy, true, true)	6m 55s
linux (linux-sanitizer, true)	2m 59s
linux (linux-debug, true, valgrind --leak-check=full --error-exitcode=1)	11m 43s
full-data-set-test (macos-x86_64-noavx2, macos-latest)	54s
full-data-set-test (linux-amd64, ubuntu-20.04)	22s
full-data-set-test (linux-x86, ubuntu-20.04)	27s
full-data-set-test (linux-arm, ubuntu-20.04, qemu-arm-static -L /usr/arm-linux-gnueabihf, bzip2 u...	1m 24s
full-data-set-test (linux-arm64, ubuntu-20.04, qemu-aarch64-static -L /usr/aarch64-linux-gnu, bzi...	1m 50s
docker	28s
	2h 44m 23s

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