show-branch: convert per-branch flags to commit-slab #29223

Job	Run time
config	6s
fuzz smoke test	1m 13s
static-analysis	5m 48s
win+Meson build	4m 9s
win build	5m 24s
osx-clang (macos-14)	20m 36s
osx-meson (macos-14)	22m 31s
rust-analysis	1m 38s
osx-reftable (macos-14)	18m 54s
sparse	3m 48s
osx-gcc (macos-14)	18m 24s
documentation	7m 56s
linux-reftable (ubuntu:rolling)	14m 28s
linux-TEST-vars (ubuntu:20.04)	9m 48s
linux-reftable-leaks (ubuntu:rolling)	44m 16s
linux-breaking-changes (ubuntu:rolling)	10m 57s
linux32 (i386/ubuntu:20.04)	10m 45s
fedora-breaking-changes-meson (fedora:latest)	10m 11s
linux-leaks (ubuntu:rolling)	43m 18s
linux-meson (ubuntu:rolling)	12m 47s
linux-sha256 (ubuntu:rolling)	10m 27s
almalinux-8 (almalinux:8)	10m 51s
linux-musl-meson (alpine:latest)	8m 4s
linux-asan-ubsan (ubuntu:rolling)	36m 29s
debian-11 (debian:11)	7m 44s
win+VS build	-1s
win+VS test	-1s
win+Meson test (3)	10m 29s
win+Meson test (2)	9m 16s
win+Meson test (5)	7m 16s
win+Meson test (0)	7m 56s
win+Meson test (9)	4m 51s
win+Meson test (6)	13m 17s
win+Meson test (8)	10m 13s
win+Meson test (1)	6m 54s
win+Meson test (7)	7m 57s
win+Meson test (4)	9m 20s
win test (1)	5m 46s
win test (4)	9m 30s
win test (6)	10m 0s
win test (0)	5m 21s
win test (7)	7m 44s
win test (9)	5m 42s
win test (5)	9m 9s
win test (2)	7m 31s
win test (8)	6m 32s
win test (3)	9m 51s
	8h 25m 5s

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