environment: move "branch.autoSetupMerge" into `struct repo_config_va… #26667

Job	Run time
config	8s
fuzz smoke test	1m 23s
win+Meson build	6m 8s
sparse	3m 23s
win build	5m 2s
static-analysis	5m 26s
documentation	7m 30s
rust-analysis	1m 52s
osx-clang (macos-14)	16m 3s
osx-meson (macos-14)	26m 14s
osx-reftable (macos-14)	16m 13s
linux-sha256 (ubuntu:rolling)	13m 58s
osx-gcc (macos-14)	20m 3s
debian-11 (debian:11)	10m 36s
linux-asan-ubsan (ubuntu:rolling)	35m 5s
linux-reftable-leaks (ubuntu:rolling)	36m 27s
linux-leaks (ubuntu:rolling)	35m 16s
linux-breaking-changes (ubuntu:rolling)	13m 46s
linux-meson (ubuntu:rolling)	15m 45s
win+VS build	0s
fedora-breaking-changes-meson (fedora:latest)	11m 0s
linux32 (i386/ubuntu:focal)	10m 48s
linux-musl-meson (alpine:latest)	8m 55s
almalinux-8 (almalinux:8)	10m 52s
linux-reftable (ubuntu:rolling)	11m 45s
linux-TEST-vars (ubuntu:20.04)	11m 23s
win+VS test	-1s
win+Meson test (6)	39s
win+Meson test (9)	34s
win+Meson test (1)	42s
win+Meson test (0)	43s
win+Meson test (7)	44s
win+Meson test (8)	32s
win+Meson test (3)	55s
win+Meson test (2)	34s
win+Meson test (5)	42s
win+Meson test (4)	32s
win test (2)	9m 15s
win test (0)	8m 22s
win test (1)	6m 29s
win test (6)	6m 52s
win test (8)	7m 28s
win test (5)	7m 28s
win test (7)	7m 5s
win test (3)	6m 32s
win test (4)	9m 34s
win test (9)	11m 18s
	7h 2m 0s

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