testrunner: only provide `TimerResults` in executor tests when desire… #19636

Job	Run time
build_make (alpine:3.23)	5m 57s
build_make (ubuntu:24.04)	3m 7s
build_cmake (alpine:3.23, false, false)	4m 30s
build_cmake (ubuntu:24.04, true, true)	2m 48s
build_cmake (ubuntu:25.10, true, true)	2m 39s
build_make (ubuntu:25.10)	3m 5s
	22m 6s

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