Add default behavior to ggshield secret ignore

[salome-voltz]

Context

Command ggshield secret ignore had no default behavior.

What has been done

Default behavior is now : ggshield secret ignore MATCH to ignore a secret using its hash. There is also an optional option --name to name the secret in the gitguardian.yaml.

Validation

• Get a secret hash
• Run ggshield secret ignore MATCH --name NAME
• The secret and its name are added to the gitguardian.yaml

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 91.65%. Comparing base (5a57931) to head (ef6bb9d).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #960      +/-   ##
==========================================
+ Coverage   91.54%   91.65%   +0.10%     
==========================================
  Files         178      178              
  Lines        7372     7383      +11     
==========================================
+ Hits         6749     6767      +18     
+ Misses        623      616       -7     

Flag	Coverage Δ
unittests	91.65% <100.00%> (+0.10%)	⬆️

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[agateau-gg]

Minor remarks, looks good overall.

[agateau-gg]

2 minor remarks. Feel free to merge once they are fixed.