Use cpu=native and fix potential CICD errors

[julian-bcw]

1. Stops caching across builds.
   • This is necessary so that we can use cpu=native and safely change GCP machines.
2. Adds cpu=native to .cargo/config.toml for microarchitectural optimizations in worker, leader, coordinator.
3. Installs clang-16 as system dependency in worker, leader, and coordinator Dockerfiles.
4. Adds linker = "clang" to .cargo/Config.toml for x86-64 Linux builds
   • This prevents linking errors with the gcc linker.
5. Enables verbose logging for the cargo build commands in Dockerfiles.