t: add greplint.pl and convert grep to test_grep #28469

Job	Run time
config	7s
fuzz smoke test	1m 15s
sparse	3m 41s
static-analysis	5m 49s
win build	1h 1m 33s
win+Meson build	1h 1m 33s
osx-clang (macos-14)	1h 1m 33s
documentation	1h 1m 33s
rust-analysis	1h 1m 33s
osx-reftable (macos-14)	1h 1m 33s
osx-gcc (macos-14)	1h 1m 33s
osx-meson (macos-14)	1h 1m 33s
linux-reftable-leaks (ubuntu:rolling)	1h 1m 33s
linux-meson (ubuntu:rolling)	1h 1m 33s
debian-11 (debian:11)	1h 1m 33s
linux32 (i386/ubuntu:focal)	1h 1m 33s
almalinux-8 (almalinux:8)	1h 1m 33s
linux-sha256 (ubuntu:rolling)	1h 1m 33s
linux-TEST-vars (ubuntu:20.04)	1h 1m 33s
linux-breaking-changes (ubuntu:rolling)	1h 1m 33s
linux-leaks (ubuntu:rolling)	1h 1m 33s
linux-reftable (ubuntu:rolling)	1h 1m 33s
linux-musl-meson (alpine:latest)	1h 1m 33s
fedora-breaking-changes-meson (fedora:latest)	1h 1m 33s
linux-asan-ubsan (ubuntu:rolling)	1h 1m 33s
win+VS build	0s
win+VS test	0s
win test	-1s
win+Meson test	-1s
	21h 43m 23s

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