Add a panic when calling namadac reveal-pk and the passed public key is already revealed

[TerzoMillenio]

Describe your changes

Closes #3069
When the public key is already revealed, the program panics with message "Public key for address {} already revealed."

Indicate on which release or other PRs this topic is based on

Checklist before merging to draft

• I have added a changelog
• Git history is in acceptable state

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.26%. Comparing base (7d70e5a) to head (dcf563c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3070   +/-   ##
=======================================
  Coverage   61.26%   61.26%           
=======================================
  Files         290      290           
  Lines       88556    88556           
=======================================
  Hits        54251    54251           
  Misses      34305    34305           

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[cwgoes]

Hi, thank you for the contribution! 🙌 - would you mind rebasing, and we'll include it in the next release?

[Fraccaman]

@cwgoes we addresses this in #3245 I think

[cwgoes]

Ah gotcha.