t: add greplint.pl and convert grep to test_grep #28326

Job	Run time
config	7s
fuzz smoke test	1m 28s
win build	3m 57s
static-analysis	3m 57s
sparse	3m 58s
win+Meson build	3m 57s
rust-analysis	3m 57s
osx-gcc (macos-14)	3m 57s
osx-reftable (macos-14)	3m 57s
documentation	3m 57s
osx-clang (macos-14)	3m 57s
osx-meson (macos-14)	3m 57s
linux32 (i386/ubuntu:focal)	3m 57s
almalinux-8 (almalinux:8)	3m 57s
linux-meson (ubuntu:rolling)	3m 57s
linux-musl-meson (alpine:latest)	3m 57s
linux-asan-ubsan (ubuntu:rolling)	3m 57s
linux-breaking-changes (ubuntu:rolling)	3m 57s
linux-sha256 (ubuntu:rolling)	3m 57s
debian-11 (debian:11)	3m 57s
linux-leaks (ubuntu:rolling)	3m 56s
linux-TEST-vars (ubuntu:20.04)	3m 56s
fedora-breaking-changes-meson (fedora:latest)	3m 56s
win+VS build	-1s
linux-reftable-leaks (ubuntu:rolling)	3m 56s
linux-reftable (ubuntu:rolling)	3m 56s
win+VS test	-1s
win test	0s
win+Meson test	-1s
	1h 32m 19s

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