refactor ExcludedFromBuild to use Conditional properly #20628

Job	Run time
build_make (ubuntu:25.10)	4m 2s
build_cmake (ubuntu:24.04, true, true)	3m 16s
build_make (alpine:3.23)	6m 26s
build_cmake (ubuntu:25.10, true, true)	3m 10s
build_cmake (alpine:3.23, false, false)	4m 18s
build_make (ubuntu:24.04)	3m 26s
	24m 38s

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