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ExternalProject: expose _ep_cache_args_script to the caller

Ben Boeckel requested to merge ben.boeckel/cmake:fix-cache-args-file-to-dep-list into master

This is needed so that the caller can add a dependency on the cache file.

Fixes: #20668 (closed)

This can be rebased back more if needed. It was broken all the way back in 3.8.0.

Do we have infrastructure to test things like this? I don't see anything existing in ExternalProjects tests.

Cc: @timpatt

Backport: release

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