refactor: Use PowerShell for input validation steps #229

Job	Run time
cli-integration (macos)	16s
updater-create-pr / cancel-previous-run	5s
cli-integration (ubuntu)	15s
cli-integration (windows)	46s
updater-test-args / cancel-previous-run	3s
updater-create-pr / validate-inputs	7s
updater-test-args / validate-inputs	4s
updater-test-args / update	13s
updater-create-pr / update	21s
updater-test-outputs	6s
	2m 16s

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