Remove generated pb files

BUILD

CMakeLists.txt

Makefile

build.yaml

include/grpc++/ext/reflection.grpc.pb.h

include/grpc++/ext/reflection.pb.h

src/cpp/ext/proto_server_reflection.h

src/cpp/ext/reflection.grpc.pb.cc

src/cpp/ext/reflection.pb.cc

test/cpp/util/proto_reflection_descriptor_database.h

tools/codegen/extensions/gen_reflection_proto.sh

tools/distrib/check_generated_pb_files.sh

tools/dockerfile/grpc_check_generated_pb_files/Dockerfile

...ockerfile/grpc_check_generated_pb_files/check_pb_files.sh

tools/run_tests/sanity/sanity_tests.yaml

tools/run_tests/sources_and_headers.json

...jects/vcxproj/grpc++_reflection/grpc++_reflection.vcxproj

...xproj/grpc++_reflection/grpc++_reflection.vcxproj.filters

...pc++_reflection_codegen/grpc++_reflection_codegen.vcxproj

...lection_codegen/grpc++_reflection_codegen.vcxproj.filters