http: add support for HTTP 429 rate limit retries #26473

Job	Run time
config	9s
fuzz smoke test	1m 25s
win+Meson build	5m 53s
osx-gcc (macos-14)	19m 8s
documentation	6m 57s
osx-clang (macos-14)	22m 20s
osx-meson (macos-14)	25m 18s
osx-reftable (macos-14)	6m 13s
sparse	3m 25s
rust-analysis	40s
win build	5m 1s
linux-sha256 (ubuntu:rolling)	10m 46s
linux-musl-meson (alpine:latest)	8m 52s
fedora-breaking-changes-meson (fedora:latest)	11m 6s
linux-leaks (ubuntu:rolling)	1m 53s
linux-meson (ubuntu:rolling)	6m 17s
linux-asan-ubsan (ubuntu:rolling)	10m 18s
debian-11 (debian:11)	9m 53s
static-analysis	5m 21s
linux-breaking-changes (ubuntu:rolling)	8m 36s
almalinux-8 (almalinux:8)	3m 30s
linux-reftable (ubuntu:rolling)	4m 54s
linux-reftable-leaks (ubuntu:rolling)	1m 45s
linux-TEST-vars (ubuntu:20.04)	2m 29s
linux32 (i386/ubuntu:focal)	4m 48s
win+VS test	0s
win+VS build	0s
win+Meson test (5)	35s
win+Meson test (3)	35s
win+Meson test (0)	33s
win+Meson test (6)	31s
win+Meson test (2)	43s
win+Meson test (9)	38s
win+Meson test (1)	33s
win+Meson test (7)	53s
win+Meson test (4)	44s
win+Meson test (8)	52s
win test (5)	6m 47s
win test (8)	6m 29s
win test (2)	8m 45s
win test (7)	7m 34s
win test (3)	7m 50s
win test (6)	6m 1s
win test (9)	9m 16s
win test (4)	5m 46s
win test (0)	9m 33s
win test (1)	7m 4s
	4h 28m 39s

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