Merge topic 'test-cleanup-COnly'

f7a165ddcb Tests: Drop redundant string(ASCII) case from COnly test
7e3229d7f9 Tests: Move LINK_FLAGS case from COnly to LinkFlags test

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Merge-request: !8161