t: add greplint.pl and convert grep to test_grep #28244

Job	Run time
config	10s
fuzz smoke test	1m 11s
rust-analysis	22m 43s
win build	22m 43s
win+VS build	0s
static-analysis	22m 43s
win+Meson build	22m 43s
osx-reftable (macos-14)	22m 43s
documentation	22m 43s
osx-meson (macos-14)	22m 43s
osx-clang (macos-14)	22m 43s
sparse	22m 43s
linux-sha256 (ubuntu:rolling)	22m 44s
osx-gcc (macos-14)	22m 43s
linux-leaks (ubuntu:rolling)	22m 44s
linux-musl-meson (alpine:latest)	22m 44s
almalinux-8 (almalinux:8)	22m 44s
linux-reftable (ubuntu:rolling)	22m 44s
debian-11 (debian:11)	22m 44s
linux-asan-ubsan (ubuntu:rolling)	22m 44s
linux-breaking-changes (ubuntu:rolling)	22m 44s
linux-reftable-leaks (ubuntu:rolling)	22m 44s
linux-TEST-vars (ubuntu:20.04)	22m 44s
linux32 (i386/ubuntu:focal)	22m 44s
linux-meson (ubuntu:rolling)	22m 44s
fedora-breaking-changes-meson (fedora:latest)	22m 44s
win+VS test	0s
win+Meson test	0s
win test	-1s
	8h 44m 2s

Provide feedback