refactor: Use cross-platform temp directory approach #256

Job	Run time
updater-test-args / validate-inputs	8s
cli-integration (windows)	54s
cli-integration (ubuntu)	16s
updater-create-pr / validate-inputs	8s
updater-test-args / cancel-previous-run	4s
cli-integration (macos)	2m 38s
updater-create-pr / cancel-previous-run	5s
updater-test-args / update	13s
updater-create-pr / update	22s
updater-test-outputs	7s
	4m 55s

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