Deduplicate CMake arguments passed through ExternalProject_Add #5007

Job	Run time
pre-commit / link-check	15s
ci-scope	3s
pre-commit / pre-commit	1m 57s
mac / clang-build (Release)	2m 39s
ubuntu / clang-build (ubuntu-24.04)	2m 47s
mac / clang-build (Debug)	2m 17s
windows / clang-build	2m 10s
windows / msvc-build (Debug)	3m 58s
ubuntu / gcc-build (ubuntu-24.04, Debug)	2m 4s
ubuntu / gcc-build (ubuntu-24.04, Release)	2m 40s
windows / msvc-build (Release)	2m 56s
windows / clang-test	1m 38s
mac / clang-test	1m 19s
ubuntu / gcc-test (ubuntu-24.04)	2m 46s
ubuntu / clang-test (ubuntu-24.04)	2m 43s
ubuntu / clang-sanitizer-build (ubuntu-24.04)	3m 52s
windows / clang-test-extended	2m 3s
windows / msvc-test	1m 51s
mac / clang-test-extended	1m 18s
ubuntu / gcc-test-extended (ubuntu-24.04)	1m 57s
ubuntu / clang-test-extended (ubuntu-24.04)	1m 42s
windows / msvc-test-extended	1m 29s
ubuntu / clang-sanitizer-test (ubuntu-24.04)	1m 7s
ubuntu / gcc-build-codecov	4m 24s
ubuntu / clang-sanitizer-test-extended (ubuntu-24.04)	1m 8s
perf / macos-clang-build-perf-stats	1m 57s
perf / ubuntu-gcc-build-perf-stats	59s
pages / build-scoreboard	12s
pages / build-doxygen-xml	21s
pages / build-sphinx	38s
pages / deploy-pages	0s
	57m 10s

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