Send last metadata when connecting to icecast. (#4270) #11971

Job	Run time
build_details	3s
build_js	2m 15s
build_opam (4.14.x)	9m 12s
build_opam (5.2.x)	5m 28s
build_win32 (x64)	4m 44s
lezer_parse	48s
build_no_depopts	6m 1s
build_posix (debian_trixie, amd64)	14m 37s
build_posix (debian_trixie, arm64)	13m 40s
build_posix (debian_bookworm, amd64)	13m 56s
build_posix (debian_bookworm, arm64)	12m 41s
run_tests (@citest)	13m 16s
build_posix (ubuntu_oracular, amd64)	13m 52s
run_tests (@doctest)	7m 49s
tree_sitter_parse	48s
update_doc	10m 47s
build_posix (ubuntu_oracular, arm64)	13m 7s
run_tests (@mediatest)	11m 57s
build_posix (ubuntu_noble, amd64)	14m 40s
build_posix (ubuntu_noble, arm64)	13m 8s
build_posix (alpine, amd64)	9m 50s
build_posix (alpine, arm64)	8m 29s
fetch_s3_artifacts	23s
build_docker_minimal (amd64)	1m 50s
build_docker_minimal (arm64)	1m 57s
build_docker (amd64)	2m 8s
update_release	0s
build_docker_alpine (amd64)	1m 27s
build_docker (arm64)	2m 3s
build_docker_alpine (arm64)	1m 1s
build_docker_alpine_minimal (amd64)	43s
build_docker_alpine_minimal (arm64)	51s
build_docker_release-minimal	0s
build_docker_release	0s
	3h 33m 31s

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