http: add support for HTTP 429 rate limit retries #26588

Job	Run time
config	8s
fuzz smoke test	1m 28s
documentation	7m 28s
win build	5m 1s
rust-analysis	1m 49s
osx-gcc (macos-14)	14m 33s
win+Meson build	6m 42s
static-analysis	5m 34s
osx-reftable (macos-14)	15m 49s
sparse	13m 59s
linux-musl-meson (alpine:latest)	4m 41s
almalinux-8 (almalinux:8)	7m 13s
linux-breaking-changes (ubuntu:rolling)	11m 46s
linux32 (i386/ubuntu:focal)	8m 57s
fedora-breaking-changes-meson (fedora:latest)	9m 55s
linux-reftable (ubuntu:rolling)	9m 38s
linux-sha256 (ubuntu:rolling)	11m 19s
win+VS build	0s
osx-clang (macos-14)	14m 14s
osx-meson (macos-14)	13m 49s
linux-meson (ubuntu:rolling)	8m 11s
linux-asan-ubsan (ubuntu:rolling)	4m 32s
linux-TEST-vars (ubuntu:20.04)	2m 18s
debian-11 (debian:11)	2m 44s
linux-reftable-leaks (ubuntu:rolling)	2m 10s
linux-leaks (ubuntu:rolling)	46s
win+VS test	0s
win test (7)	6m 52s
win test (0)	6m 30s
win test (3)	5m 37s
win test (9)	9m 13s
win test (5)	6m 51s
win test (6)	6m 49s
win test (4)	9m 10s
win test (2)	8m 47s
win test (8)	7m 39s
win test (1)	7m 51s
win+Meson test (0)	32s
win+Meson test (3)	34s
win+Meson test (9)	38s
win+Meson test (4)	55s
win+Meson test (2)	32s
win+Meson test (1)	37s
win+Meson test (5)	35s
win+Meson test (6)	33s
win+Meson test (7)	46s
win+Meson test (8)	1m 2s
	4h 26m 47s

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