Ensure that ctest is called with --no-tests=error. (#2163)

This PR ensures that all calls to `ctest` include the flag `--no-tests=error`. See rapidsai/build-planning#18.

Authors:
  - Bradley Dice (https://github.com/bdice)

Approvers:
  - Jake Awe (https://github.com/AyodeAwe)

URL: #2163

ci/run_ctests.sh

@@ -6,4 +6,4 @@ set -euo pipefail
 # Support customizing the ctests' install location
 cd "${INSTALL_PREFIX:-${CONDA_PREFIX:-/usr}}/bin/gtests/libraft/"
 
-ctest --output-on-failure "$@"
+ctest --output-on-failure --no-tests=error "$@"