Merge topic 'genex-CONFIG-validate-all'

910ada1a88 Genex: $<CONFIG:> syntax of all entries checked
42e417ad12 GeneratorExpression Tests: Remove duplicate test entry

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: buildbot <buildbot@kitware.com>
Merge-request: !8082