test: rename scan image JSON format cases

[G-Rath]

Only one of these tests actually uses --all-packages but they all output in JSON format so I think this is a better name and that also means its reasonable for us to add more cases such as in #2021

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.02%. Comparing base (4f1b54b) to head (6e2a8b4).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2024   +/-   ##
=======================================
  Coverage   66.02%   66.02%           
=======================================
  Files         172      172           
  Lines       16222    16222           
=======================================
  Hits        10710    10710           
  Misses       4857     4857           
  Partials      655      655           

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[G-Rath]

@another-rex it happened in CI! (cli v3 nil pointer panic)