nerdctl-stub: Allow positional arguments mixed with flags #14690

Job	Run time
check-paths / check	11s
package (mac, x86_64, macos-13)	14m 22s
package (mac, aarch64, macos-latest)	6m 36s
package (linux, ubuntu-22.04)	7m 5s
package (win, windows-2019)	22m 46s
Test Signing (Windows)	0s
Test Signing (macOS)	0s
	51m 0s

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