Remove (unreleased) Body::discard #2633

Job	Run time
build_versions (stable)	16s
Test	44s
build_versions (beta)	17s
Test (charset)	41s
Test	35s
build_versions (1.71.1)	21s
cargo-deny (aarch64-apple-ios)	18s
Test (cookies)	45s
Test (charset)	31s
cargo-deny (aarch64-linux-android)	21s
Test (socks-proxy)	42s
Test (cookies)	42s
cargo-deny (i686-pc-windows-gnu)	21s
Test (gzip)	54s
Docs	1m 25s
cargo-deny (i686-pc-windows-msvc)	20s
Test (socks-proxy)	38s
Test (brotli)	41s
cargo-deny (i686-unknown-linux-gnu)	19s
Test (gzip)	30s
Test (json)	1m 2s
cargo-deny (wasm32-unknown-unknown)	18s
Lint	15s
Test (native-tls)	50s
Test (brotli)	42s
cargo-deny (x86_64-apple-darwin)	17s
Test (json)	31s
cargo-deny (x86_64-apple-ios)	22s
Test (native-tls)	39s
cargo-deny (x86_64-pc-windows-gnu)	17s
cargo-deny (x86_64-pc-windows-msvc)	18s
cargo-deny (x86_64-unknown-linux-gnu)	20s
cargo-deny (x86_64-unknown-redox)	21s
	17m 33s

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