Remove unmaintained BLC (#19801)

Author: leezu

ci/docker/Dockerfile.build.ubuntu_blc

@@ -213,10 +213,3 @@ services:
       dockerfile: Dockerfile.build.ubuntu_cpu_jekyll
       cache_from:
         - ${DOCKER_CACHE_REGISTRY}/build.ubuntu_cpu_jekyll:latest
-  ubuntu_blc:
-    image: ${DOCKER_CACHE_REGISTRY}/build.ubuntu_blc:latest
-    build:
-      context: .
-      dockerfile: Dockerfile.build.ubuntu_blc
-      cache_from:
-        - ${DOCKER_CACHE_REGISTRY}/build.ubuntu_blc:latest

ci/docker/docker-compose.yml

@@ -690,10 +690,6 @@ build_ubuntu_gpu_large_tensor() {
     ninja
 }
 
-build_ubuntu_blc() {
-    echo "pass"
-}
-
 # Testing
 
 sanity_check() {
@@ -1345,12 +1341,6 @@ build_static_python_cu102() {
     popd
 }
 
-# broken_link_checker
-broken_link_checker() {
-    set -ex
-    ./tests/nightly/broken_link_checker_test/broken_link_checker.sh
-}
-
 # artifact repository unit tests
 test_artifact_repository() {
     set -ex