refactor: Improve test structure with shared data and individual cases #262

Job	Run time
cli-integration (macos)	4m 21s
cli-integration (ubuntu)	13s
cli-integration (windows)	30s
updater-test-args / validate-inputs	8s
updater-create-pr / validate-inputs	8s
updater-create-pr / cancel-previous-run	3s
updater-test-args / cancel-previous-run	5s
updater-test-args / update	10s
updater-create-pr / update	25s
updater-test-outputs	7s
	6m 10s

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