It has been disabled since some fuzzers were coming from cncf/cncf-fuzzing repository and keeping them up-to-date was difficult. However, the external repository is no longer used from oss-fuzz since https://github.com/google/oss-fuzz/pull/8360. As like other unit/integration tests, we should maintain the fuzzers in this repository and fix any failures. Signed-off-by: Kazuyoshi Kato <katokazu@amazon.com>