move proxy check to aws_http_proxy_new_socket_channel #2216

Job	Run time
macos-x64	3m 10s
windows-shared-libs	5m 21s
linux-shared-libs	4m 9s
clang-sanitizers (,address,undefined)	5m 42s
windows-vc17 (x64)	4m 49s
windows	4m 18s
windows-vc17 (x86)	4m 37s
windows-app-verifier	6m 41s
downstream	44m 0s
clang-sanitizers (,thread)	5m 1s
byo-crypto	3m 0s
macos (dispatch_queue)	5m 40s
localhost-test-linux	7m 26s
macos (kqueue)	2m 44s
linux-compat (al2-x64)	4m 0s
localhost-test-macos (dispatch_queue)	9m 1s
linux-compat (rhel8-x64)	4m 26s
linux-compat (manylinux1-x86)	4m 41s
linux-compat (opensuse-leap)	4m 45s
linux-compat (manylinux2014-x86)	4m 42s
localhost-test-macos (kqueue)	5m 1s
linux-compat (manylinux1-x64)	3m 47s
linux-compiler-compat (gcc-8)	4m 40s
linux-compat (fedora-34-x64)	4m 17s
localhost-test-win	6m 56s
linux-compiler-compat (gcc-6)	4m 15s
linux-compiler-compat (gcc-7)	4m 9s
linux-compat (manylinux2014-x64)	4m 6s
linux-compiler-compat (gcc-13, --cmake-extra=-DCMAKE_EXE_LINKER_FLAGS="-lresolv")	9m 47s
linux-compiler-compat (clang-6)	7m 9s
linux-compiler-compat (clang-15)	5m 3s
linux-compiler-compat (clang-9)	7m 18s
linux-compiler-compat (clang-11)	4m 49s
linux-compiler-compat (gcc-11)	6m 0s
linux-compiler-compat (gcc-5)	4m 24s
linux-compiler-compat (clang-8)	7m 32s
linux-compiler-compat (clang-10)	5m 29s
linux-compiler-compat (gcc-4.8)	3m 37s
linux-compiler-compat (clang-17)	6m 31s
	4h 3m 3s

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