Add parameter validation to CMake helper functions #269

Job	Run time
cli-integration (macos)	4m 20s
cli-integration (ubuntu)	16s
cli-integration (windows)	43s
updater-test-args / cancel-previous-run	3s
updater-create-pr / cancel-previous-run	4s
updater-test-args / validate-inputs	8s
updater-create-pr / validate-inputs	7s
updater-create-pr / update	24s
updater-test-args / update	19s
updater-test-outputs	4s
	6m 28s

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