http: add support for HTTP 429 rate limit retries #26462

Job	Run time
config	10s
fuzz smoke test	1m 7s
win+Meson build	6m 19s
win build	4m 59s
static-analysis	4m 58s
win+VS build	-1s
osx-reftable (macos-14)	14m 20s
osx-clang (macos-14)	14m 24s
sparse	3m 33s
osx-meson (macos-14)	14m 7s
osx-gcc (macos-14)	14m 28s
documentation	7m 25s
linux-reftable (ubuntu:rolling)	13m 54s
linux-sha256 (ubuntu:rolling)	13m 55s
fedora-breaking-changes-meson (fedora:latest)	10m 56s
almalinux-8 (almalinux:8)	11m 7s
linux-breaking-changes (ubuntu:rolling)	13m 35s
rust-analysis	1m 32s
linux-meson (ubuntu:rolling)	13m 53s
linux-musl-meson (alpine:latest)	9m 0s
linux-leaks (ubuntu:rolling)	13m 54s
debian-11 (debian:11)	10m 42s
linux-reftable-leaks (ubuntu:rolling)	13m 53s
linux-asan-ubsan (ubuntu:rolling)	9m 36s
linux-TEST-vars (ubuntu:20.04)	12m 44s
linux32 (i386/ubuntu:focal)	8m 50s
win+VS test	0s
win test (7)	7m 42s
win test (4)	10m 48s
win test (1)	7m 44s
win test (8)	6m 37s
win test (5)	6m 37s
win test (6)	5m 20s
win test (2)	6m 19s
win test (0)	9m 34s
win test (3)	7m 7s
win test (9)	6m 23s
win+Meson test (7)	30s
win+Meson test (2)	34s
win+Meson test (1)	37s
win+Meson test (4)	36s
win+Meson test (5)	31s
win+Meson test (6)	36s
win+Meson test (9)	30s
win+Meson test (3)	32s
win+Meson test (0)	31s
win+Meson test (8)	41s
	5h 23m 9s

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