Remove end2end_certs library.

Makefile

test/core/end2end/gen_build_yaml.py

tools/run_tests/sources_and_headers.json

vsprojects/buildtests_c.sln

.../vcxproj/test/end2end/end2end_certs/end2end_certs.vcxproj

.../test/end2end/end2end_certs/end2end_certs.vcxproj.filters

...st/end2end/fixtures/h2_census_test/h2_census_test.vcxproj

...nd2end/fixtures/h2_compress_test/h2_compress_test.vcxproj

.../end2end/fixtures/h2_fakesec_test/h2_fakesec_test.vcxproj

...j/test/end2end/fixtures/h2_full_test/h2_full_test.vcxproj

...st/end2end/fixtures/h2_oauth2_test/h2_oauth2_test.vcxproj

...test/end2end/fixtures/h2_proxy_test/h2_proxy_test.vcxproj

...res/h2_sockpair+trace_test/h2_sockpair+trace_test.vcxproj

...res/h2_sockpair_1byte_test/h2_sockpair_1byte_test.vcxproj

...nd2end/fixtures/h2_sockpair_test/h2_sockpair_test.vcxproj

...2end/fixtures/h2_ssl_proxy_test/h2_ssl_proxy_test.vcxproj

...roj/test/end2end/fixtures/h2_ssl_test/h2_ssl_test.vcxproj

...nd2end/fixtures/h2_uchannel_test/h2_uchannel_test.vcxproj

...oj/test/end2end/tests/end2end_tests/end2end_tests.vcxproj