line-log: untangle the -L machinery and make get_commit_action() pure #29010

Job	Run time
config	6s
fuzz smoke test	1m 22s
win build	5m 25s
win+Meson build	4m 8s
static-analysis	6m 12s
documentation	7m 36s
sparse	3m 39s
rust-analysis	1m 50s
osx-meson (macos-14)	37m 28s
osx-clang (macos-14)	33m 20s
linux32 (i386/ubuntu:20.04)	6h 0m 4s
osx-reftable (macos-14)	32m 31s
osx-gcc (macos-14)	31m 50s
linux-sha256 (ubuntu:rolling)	25m 50s
debian-11 (debian:11)	21m 45s
linux-reftable (ubuntu:rolling)	24m 38s
linux-TEST-vars (ubuntu:20.04)	24m 27s
linux-leaks (ubuntu:rolling)	59m 9s
almalinux-8 (almalinux:8)	21m 4s
fedora-breaking-changes-meson (fedora:latest)	20m 49s
linux-breaking-changes (ubuntu:rolling)	6h 0m 3s
linux-musl-meson (alpine:latest)	22m 33s
linux-reftable-leaks (ubuntu:rolling)	59m 18s
linux-asan-ubsan (ubuntu:rolling)	1h 11m 49s
linux-meson (ubuntu:rolling)	24m 58s
win+VS build	0s
win+VS test	0s
win test (3)	10m 35s
win test (0)	11m 22s
win test (9)	6m 59s
win test (7)	20m 19s
win test (5)	7m 26s
win test (2)	7m 50s
win test (1)	6m 49s
win test (8)	6m 43s
win test (6)	44m 53s
win test (4)	10m 22s
win+Meson test (2)	8m 28s
win+Meson test (6)	39m 24s
win+Meson test (7)	10m 38s
win+Meson test (4)	9m 50s
win+Meson test (1)	6m 24s
win+Meson test (5)	10m 56s
win+Meson test (9)	9m 38s
win+Meson test (8)	8m 7s
win+Meson test (0)	7m 51s
win+Meson test (3)	57m 46s
	1d 2h 4m 14s

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