Merge topic 'ctest-show-only-json-schema'

2e7bca5f05 ctest: Add JSON schema for --show-only=json-v1 output
fe1cd4e157 Help: Make docs for ctest --show-only=json-v1 reflect the implementation

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !10865