Shell onboardingcodes command should print all onboardingcodes when no argument supplied

[lmpprk]

Problem

PR #12963 updated the command onboardingcodes to require a rendezvous type, but with the handling logic still indicates that when no arguments supplied, the command should print all onboardingcodes

But it's not doing that now. the onboardingcodes command alone has no effect with no argument is supplied, and one would need to type onboardingcodes none to print the codes which is not very intuitive.

Proposed Solution

onboardingcodes command should print onboarding codes, or the help screen to tell user that they need to specify a rendezvous type.

[stale]

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[stale]

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