chore(sca): change SCAIgnoreVulnerability docstring to add new type of accepted identifier

[gg-jonathangriffe]

This PR adds a new field cve_id to SCAIgnoredVulnerability to allow alternatively ignoring a vulnerability by cve_id and not identifier.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.38%. Comparing base (82f30b9) to head (766503f). Report is 2 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #102      +/-   ##
==========================================
+ Coverage   92.37%   92.38%   +0.01%     
==========================================
  Files           6        6              
  Lines         695      696       +1     
==========================================
+ Hits          642      643       +1     
  Misses         53       53              

Flag	Coverage Δ
unittests	92.38% <100.00%> (+0.01%)	:arrow_up:

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[agateau-gg]

I think we can close that one. Do you agree @gg-jonathangriffe?