limit benchmark test to singlethreaded one only

[lplewa]

Description

Checklist

• Code compiles without errors locally
• All tests pass locally
• CI workflows execute properly

• CI workflows, not executed per PR (e.g. Nightly), execute properly
• New tests added, especially if they will fail without my changes
• Added/extended example(s) to cover this functionality
• Extended the README/documentation
• All newly added source files have a license
• All newly added source files are referenced in CMake files
• Logger (with debug/info/... messages) is used
• All API changes are reflected in docs and def/map files, and are tested

[kswiecicki]

Does this filter those benchmarks?

unified-memory-framework/benchmark/benchmark.cpp

Line 62 in 4c54366

->Apply(&multithreaded);

If so, it might be more appropriate to remove ->Apply(&multithreaded); when registering the benchmarks.

[lplewa]

Does this filter those benchmarks?

unified-memory-framework/benchmark/benchmark.cpp

Line 62 in 4c54366

->Apply(&multithreaded);

If so, it might be more appropriate to remove ->Apply(&multithreaded); when registering the benchmarks.

Well we want to have multithreded benchmark as part of benchmarks workflow. This PR is only to disable MT benchmarks as part of "ctest" command

[PatKamin]

Much shorter benchmark tests, thanks!