Add trap and unreachable builtins to std.cfg #20238

Job	Run time
build_cmake (alpine:3.23, false, false)	3m 48s
build_make (alpine:3.23)	6m 5s
build_make (ubuntu:25.10)	5m 1s
build_make (ubuntu:24.04)	4m 25s
build_cmake (ubuntu:25.10, true, true)	5m 34s
build_cmake (ubuntu:24.04, true, true)	5m 26s
	30m 19s

Provide feedback