Merge topic 'verify-private-header-sets'

b61637f90f File sets: Add verification of private file sets
61df2e15a2 Help: Verification target also sets CXX_SCAN_FOR_MODULES to false
909b54023a File sets: Specify verify file set target names in one place
20219414c3 File sets: Always verify interface files sets of executable targets
c7a1d5ee58 Tests: Rename VerifyHeaderSets tests to VerifyInterfaceHeaderSets

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Merge-request: !11565