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catalyst: transport Catalyst API variables around

Ben Boeckel requested to merge ben.boeckel/paraview:catalyst-cmake-api-usage into master

ParaView doesn't use find_package(catalyst) in the right scope for everything (since it is optionally embedded), so instead shuttle the variable to the necessary places via a global property.

Logic for external Catalyst versions is added to minimize the chances of things going wrong if/when an external Catalyst is supported.

Fixes: #20796 (closed)

Cc: @ethan.stam

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