Cleanup CDT repo related to the docker + Java 21 updates
- Fix links for cdt-infra - The cdt-infra git repo is now archived, so this commit updates the links to the current values. - Add new Docker related files to the gitattributes as text files - Update DEFAULT_BUFFER_SIZE for Java 21's value when building JNI, this also means the dll/exe need a rebuild - add a toolchains.xml since we use Java 21 toolchain, but most bundles are Java 17 still