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FetchContent: Protect ExternalProject keywords from unknown arguments

Brad King requested to merge brad.king/cmake:FetchContent-unparsed-arguments into master

ExternalProject_Add treats all keyword arguments as multi-valued. FetchContent re-orders some keyword arguments w.r.t. unparsed arguments. Add an internal keyword argument to separate the keyword values from following unparsed arguments.

This was exposed by !7988 (merged) by adding GIT_REPOSITORY to the set of re-ordered keyword arguments. This caused its value to absorb following unparsed arguments.

Fixes: #25029 (closed)
Backport: release

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