Merge topic 'truncation_invalid' into release-3.24

bd30d20bc3 Tests: Add cases covering bad ctest output truncation types
dbf840392d ctest: print error for invalid CTEST_CUSTOM_TEST_OUTPUT_TRUNCATION

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: buildbot <buildbot@kitware.com>
Merge-request: !7596