Move parsing http retries to EnvironmentOptions #3000

Job	Run time
macos-x86_64	29m 57s
sdist	14m 13s
linux-arm (aarch64-unknown-linux-gnu, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	18m 21s
linux-powerpc (powerpc64le-unknown-linux-gnu, ppc64le, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	15m 10s
linux-arm (arm-unknown-linux-musleabihf, arm)	16m 18s
linux-powerpc (powerpc64-unknown-linux-gnu, ppc64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	14m 58s
linux-arm (armv7-unknown-linux-gnueabihf, armv7)	17m 0s
musllinux (i686-unknown-linux-musl)	15m 12s
linux-s390x (s390x-unknown-linux-gnu, s390x)	13m 38s
windows (i686-pc-windows-msvc, x86)	19m 53s
macos-aarch64	26m 46s
musllinux-cross (armv7-unknown-linux-musleabihf, armv7)	15m 37s
windows (aarch64-pc-windows-msvc, x64)	21m 16s
musllinux (x86_64-unknown-linux-musl)	14m 33s
linux-riscv64 (riscv64gc-unknown-linux-gnu, riscv64)	12m 16s
linux (i686-unknown-linux-gnu, gcc -m32)	12m 6s
musllinux-cross (aarch64-unknown-linux-musl, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	18m 30s
windows (x86_64-pc-windows-msvc, x64)	17m 37s
linux (x86_64-unknown-linux-gnu, gcc)	11m 7s
	5h 24m 28s

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