Merge topic 'ensight-reader-static-mesh-cache'

f5b2c039 ensight-reader: Expand test to use all  output partitions
e2d98ea2 ensight-reader: Combined reader uses static mesh cache
dd2ee237 ensight-reader: Add a test for static mesh caching
dd7105bd ensight-reader: Use in-class member initialization

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: buildbot <buildbot@kitware.com>
Reviewed-by: Charles Gueunet <charles.gueunet@kitware.com>
Reviewed-by: Mathieu Westphal (Kitware) <mathieu.westphal@kitware.com>
Merge-request: !11295