tools/testcerts: dynamically generate integration test certs via BoringSSL C++ tool + Bazel genrule#44331

Copilot wants to merge 3 commits intomainenvoyproxy/envoy:mainfrom

copilot/generate-test-certificates-dynamicallyenvoyproxy/envoy:copilot/generate-test-certificates-dynamicallyCopy head branch name to clipboard