[NOT READY FOR MERGE] Fix the issue where cmake/ctest finds 0 test despite test binaries having been properly built #17136
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Description
The following command shows that cmake/ctest finds 0 test (although all the test binaries have been properly built and can be individually run in the
/home/coder/cudf/cpp/build/latest/gtests
directory).The reason is that the subproject KvikIO sets the cmake cache variable
BUILD_TESTING
toOFF
and propagates it to cuDF project. This PR provides a fix.Checklist