Resolve sanity failures

CMakeLists.txt

Makefile

build.yaml

test/core/end2end/BUILD

test/core/end2end/fixtures/h2_http_proxy.c

test/core/end2end/fixtures/http_proxy_fixture.c

test/core/end2end/fixtures/http_proxy_fixture.h

tools/run_tests/generated/sources_and_headers.json

vsprojects/vcxproj/grpc_test_util/grpc_test_util.vcxproj

...cts/vcxproj/grpc_test_util/grpc_test_util.vcxproj.filters

...j/grpc_test_util_unsecure/grpc_test_util_unsecure.vcxproj

...est_util_unsecure/grpc_test_util_unsecure.vcxproj.filters

...ojects/vcxproj/test/grpc_benchmark/grpc_benchmark.vcxproj