refactor: consolidate skip-changelog flavors into single config #274

Job	Run time
cli-integration (ubuntu)	16s
cli-integration (windows)	37s
cli-integration (macos)	4m 17s
updater-create-pr / cancel-previous-run	3s
updater-create-pr / validate-inputs	7s
updater-test-args / cancel-previous-run	4s
updater-test-args / validate-inputs	10s
updater-create-pr / update	25s
updater-test-args / update	9s
updater-test-outputs	4s
	6m 12s

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