Mmillet/spi 515 add all secrets option to ggshield secret scans

[gg-mmill]

• Add the --all-secrets option, such that ignore options are "ignored": all secrets are returned, with is_excluded / exclude_reason (sic) set appropriately in the policy breaks.
• Adds a message when excluded secrets are found, to advertise the feature
• Serialize secret options in a header, for option usage monitoring

What has been done

• add --all-secret option
• update output handlers
  • json output is always extended
  • text output
    • when option is not passed, add line below file info showing number of hidden secrets
    • when option is passed, show all secrets, and add Exclude reason when appropriate

Validation

Run ggshield scans on a file containing secrets with ignored / resolved issues, with and without --all-secrets option

PR check list

• As much as possible, the changes include tests (unit and/or functional)
• If the changes affect the end user (new feature, behavior change, bug fix) then the PR has a changelog entry (see doc/dev/getting-started.md). If the changes do not affect the end user, then the skip-changelog label has been added to the PR.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.05%. Comparing base (ee56436) to head (cb39b68).
Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1024      +/-   ##
==========================================
+ Coverage   92.03%   92.05%   +0.01%     
==========================================
  Files         181      181              
  Lines        7708     7726      +18     
==========================================
+ Hits         7094     7112      +18     
  Misses        614      614              

Flag	Coverage Δ
unittests	92.05% <100.00%> (+0.01%)	⬆️

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[agateau-gg]

Minor remarks, but this looks good, and the addition of factories is great!

[agateau-gg]

Looks good!