Factor out source.dump/source.drop (#4207) #11752

Job	Run time
build_details	4s
build_opam (4.14.x)	9m 7s
build_js	1m 51s
build_opam (5.2.x)	5m 7s
tree_sitter_parse	54s
build_no_depopts	5m 44s
build_posix (debian_trixie, amd64)	15m 5s
build_win32 (x64)	17m 32s
lezer_parse	50s
build_posix (debian_trixie, arm64)	27m 38s
build_posix (debian_bookworm, amd64)	15m 15s
run_tests (@citest)	12m 57s
build_posix (debian_bookworm, arm64)	26m 10s
update_doc	0s
run_tests (@doctest)	7m 31s
build_posix (ubuntu_oracular, amd64)	13m 43s
run_tests (@mediatest)	12m 19s
build_posix (ubuntu_oracular, arm64)	27m 43s
build_posix (ubuntu_noble, amd64)	14m 42s
build_posix (ubuntu_noble, arm64)	26m 40s
build_posix (alpine, amd64)	12m 40s
build_posix (alpine, arm64)	21m 26s
fetch_s3_artifacts	28s
update_release	19s
build_docker_alpine (amd64)	1m 3s
build_docker_alpine (arm64)	1m 9s
build_docker_minimal (amd64)	3m 22s
build_docker (amd64)	2m 35s
build_docker_minimal (arm64)	3m 24s
build_docker (arm64)	3m 15s
build_docker_alpine_minimal (amd64)	1m 2s
build_docker_alpine_minimal (arm64)	57s
build_docker_release	1m 46s
build_docker_release-minimal	3m 10s
	4h 57m 28s

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