refactor: simplify dangerfile to focus on testing and flavor improvem… #275

Job	Run time
updater-test-args / validate-inputs	9s
cli-integration (ubuntu)	15s
cli-integration (macos)	4m 21s
updater-create-pr / validate-inputs	10s
updater-test-args / cancel-previous-run	4s
cli-integration (windows)	49s
updater-create-pr / cancel-previous-run	3s
updater-test-args / update	12s
updater-create-pr / update	21s
updater-test-outputs	6s
	6m 30s

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