CTest: Teach --show-only= to reject unknown values

33 jobs for ctest-json-available-only
Status Job ID Name Coverage
  External
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passed ghostflow-stager

passed ghostflow-stager

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passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager