t5710: use proper file:// URIs for absolute paths #27270

Job	Run time
config	7s
fuzz smoke test	1m 9s
win build	5m 12s
win+Meson build	5m 38s
documentation	7m 5s
rust-analysis	1m 35s
static-analysis	5m 19s
sparse	3m 44s
osx-clang (macos-14)	18m 25s
win+VS build	-1s
osx-reftable (macos-14)	24m 36s
osx-gcc (macos-14)	19m 29s
osx-meson (macos-14)	21m 29s
linux-sha256 (ubuntu:rolling)	10m 33s
almalinux-8 (almalinux:8)	11m 12s
debian-11 (debian:11)	9m 55s
linux32 (i386/ubuntu:focal)	10m 18s
fedora-breaking-changes-meson (fedora:latest)	10m 3s
linux-breaking-changes (ubuntu:rolling)	12m 22s
linux-reftable (ubuntu:rolling)	14m 13s
linux-TEST-vars (ubuntu:20.04)	13m 18s
linux-asan-ubsan (ubuntu:rolling)	33m 43s
linux-reftable-leaks (ubuntu:rolling)	28m 14s
linux-meson (ubuntu:rolling)	13m 33s
linux-leaks (ubuntu:rolling)	26m 58s
linux-musl-meson (alpine:latest)	8m 7s
win+VS test	-1s
win test (0)	10m 22s
win test (5)	7m 9s
win test (2)	9m 9s
win test (1)	8m 19s
win test (6)	6m 47s
win test (3)	7m 1s
win test (4)	10m 8s
win test (7)	5m 57s
win test (9)	8m 14s
win test (8)	5m 20s
win+Meson test (4)	6m 45s
win+Meson test (6)	14m 19s
win+Meson test (3)	5m 38s
win+Meson test (7)	11m 19s
win+Meson test (5)	7m 6s
win+Meson test (1)	8m 43s
win+Meson test (9)	7m 38s
win+Meson test (2)	8m 25s
win+Meson test (8)	11m 40s
win+Meson test (0)	6m 31s
	8h 2m 45s

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