http: add support for HTTP 429 rate limit retries #25526

Job	Run time
config	9s
fuzz smoke test	1m 22s
win+VS build	0s
win build	4m 40s
win+Meson build	3m 52s
static-analysis	5m 32s
sparse	3m 33s
documentation	7m 55s
rust-analysis	1m 50s
osx-reftable (macos-14)	19m 31s
osx-clang (macos-14)	22m 34s
osx-meson (macos-14)	26m 51s
osx-gcc (macos-14)	24m 18s
linux-sha256 (ubuntu:rolling)	13m 2s
debian-11 (debian:11)	9m 42s
linux-reftable-leaks (ubuntu:rolling)	34m 21s
linux-reftable (ubuntu:rolling)	13m 46s
linux-musl-meson (alpine:latest)	8m 18s
linux-asan-ubsan (ubuntu:rolling)	34m 51s
linux-TEST-vars (ubuntu:20.04)	13m 20s
linux-breaking-changes (ubuntu:rolling)	12m 10s
almalinux-8 (almalinux:8)	9m 45s
fedora-breaking-changes-meson (fedora:latest)	10m 7s
linux-leaks (ubuntu:rolling)	34m 16s
linux-meson (ubuntu:rolling)	14m 13s
linux32 (i386/ubuntu:focal)	10m 22s
win+VS test	0s
win+Meson test (1)	10m 1s
win+Meson test (4)	7m 44s
win+Meson test (2)	12m 0s
win+Meson test (6)	11m 50s
win+Meson test (0)	9m 45s
win+Meson test (9)	7m 27s
win+Meson test (7)	9m 55s
win+Meson test (5)	15m 35s
win+Meson test (8)	8m 38s
win+Meson test (3)	10m 56s
win test (1)	6m 29s
win test (0)	7m 37s
win test (2)	8m 55s
win test (7)	7m 5s
win test (9)	5m 38s
win test (3)	6m 9s
win test (6)	9m 29s
win test (5)	7m 27s
win test (4)	9m 29s
win test (8)	10m 53s
	8h 43m 22s

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