Reinstate ConnectProxyConnector #2652

Job	Run time
build_versions (stable)	9s
Test	41s
build_versions (beta)	21s
Docs	1m 30s
Test (charset)	42s
build_versions (1.71.1)	16s
Test (cookies)	46s
Test (socks-proxy)	43s
Test	31s
Test (gzip)	40s
Test (charset)	42s
cargo-deny (aarch64-apple-ios)	18s
Lint	28s
Test (brotli)	44s
Test (cookies)	33s
cargo-deny (aarch64-linux-android)	18s
Test (json)	43s
Test (socks-proxy)	35s
cargo-deny (i686-pc-windows-gnu)	19s
Test (native-tls)	52s
Test (gzip)	31s
cargo-deny (i686-pc-windows-msvc)	21s
Test (brotli)	34s
cargo-deny (i686-unknown-linux-gnu)	17s
Test (json)	31s
cargo-deny (wasm32-unknown-unknown)	19s
Test (native-tls)	41s
cargo-deny (x86_64-apple-darwin)	20s
cargo-deny (x86_64-apple-ios)	17s
cargo-deny (x86_64-pc-windows-gnu)	22s
cargo-deny (x86_64-pc-windows-msvc)	19s
cargo-deny (x86_64-unknown-linux-gnu)	19s
cargo-deny (x86_64-unknown-redox)	17s
	16m 59s

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