feat: Make skip git the default behavior

[another-rex]

Also removes the --json flag since that has been deprecated for a while now. The json tests are not deleted, as there are the same tests with the --format json flag.

Succeeds: #1311
Closes: #1277

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.31%. Comparing base (5d9ea86) to head (f2ae862).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1584      +/-   ##
==========================================
+ Coverage   69.30%   69.31%   +0.01%     
==========================================
  Files         200      200              
  Lines       19034    19033       -1     
==========================================
+ Hits        13191    13193       +2     
+ Misses       5135     5133       -2     
+ Partials      708      707       -1     

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[cuixq]

Do we need to update docs about this behavior change? (not sure if skipping git is documented...)

[another-rex]

Good point, I'll add the new flags to the docs.