t3070: skip ls-files tests with backslash patterns on Windows #28030

Job	Run time
config	8s
fuzz smoke test	1m 31s
win+Meson build	4m 14s
static-analysis	5m 46s
documentation	7m 35s
sparse	3m 43s
rust-analysis	1m 26s
osx-meson (macos-14)	59m 31s
win build	4m 50s
linux-asan-ubsan (ubuntu:rolling)	1h 10m 50s
osx-clang (macos-14)	6h 0m 18s
linux-reftable-leaks (ubuntu:rolling)	47m 1s
osx-reftable (macos-14)	29m 16s
linux-TEST-vars (ubuntu:20.04)	17m 31s
almalinux-8 (almalinux:8)	23m 3s
linux-reftable (ubuntu:rolling)	24m 12s
osx-gcc (macos-14)	6h 0m 16s
linux-sha256 (ubuntu:rolling)	28m 28s
linux-breaking-changes (ubuntu:rolling)	24m 50s
linux-musl-meson (alpine:latest)	23m 33s
linux-leaks (ubuntu:rolling)	38m 59s
debian-11 (debian:11)	21m 47s
fedora-breaking-changes-meson (fedora:latest)	18m 4s
linux-meson (ubuntu:rolling)	25m 28s
linux32 (i386/ubuntu:focal)	6h 0m 4s
win+VS build	-1s
win+VS test	-1s
win+Meson test (0)	8m 2s
win+Meson test (8)	9m 39s
win+Meson test (1)	10m 27s
win+Meson test (3)	10m 17s
win+Meson test (9)	6m 15s
win+Meson test (5)	9m 22s
win+Meson test (6)	14m 25s
win+Meson test (7)	8m 12s
win+Meson test (4)	7m 19s
win+Meson test (2)	59m 33s
win test (1)	7m 24s
win test (0)	10m 38s
win test (3)	58m 37s
win test (5)	9m 24s
win test (6)	8m 23s
win test (7)	6m 21s
win test (9)	4m 38s
win test (2)	10m 10s
win test (4)	12m 33s
win test (8)	6m 23s
	1d 6h 40m 24s

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