http: add support for HTTP 429 rate limit retries #26461

Job	Run time
config	7s
fuzz smoke test	1m 10s
win build	5m 35s
win+Meson build	6m 11s
static-analysis	5m 2s
sparse	3m 44s
documentation	7m 18s
osx-clang (macos-14)	18m 53s
osx-meson (macos-14)	37m 34s
osx-reftable (macos-14)	19m 39s
osx-gcc (macos-14)	19m 59s
rust-analysis	1m 50s
win+VS build	0s
linux-sha256 (ubuntu:rolling)	14m 27s
linux-reftable (ubuntu:rolling)	14m 33s
linux-leaks (ubuntu:rolling)	28m 40s
linux-meson (ubuntu:rolling)	15m 9s
linux-breaking-changes (ubuntu:rolling)	13m 19s
almalinux-8 (almalinux:8)	8m 21s
linux-TEST-vars (ubuntu:20.04)	14m 8s
linux-reftable-leaks (ubuntu:rolling)	30m 38s
linux-asan-ubsan (ubuntu:rolling)	36m 11s
linux-musl-meson (alpine:latest)	7m 26s
debian-11 (debian:11)	10m 40s
linux32 (i386/ubuntu:focal)	11m 16s
fedora-breaking-changes-meson (fedora:latest)	10m 38s
win+VS test	0s
win test (3)	8m 22s
win test (1)	7m 52s
win test (7)	7m 19s
win test (6)	5m 28s
win test (8)	6m 36s
win test (2)	8m 38s
win test (9)	9m 7s
win test (0)	9m 51s
win test (4)	9m 55s
win test (5)	6m 48s
win+Meson test (0)	37s
win+Meson test (2)	31s
win+Meson test (6)	1m 36s
win+Meson test (3)	1m 36s
win+Meson test (4)	35s
win+Meson test (5)	33s
win+Meson test (7)	29s
win+Meson test (8)	34s
win+Meson test (1)	36s
win+Meson test (9)	33s
	7h 10m 4s

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