Mmillet/spi 671 improve ignore reason

[gg-mmill]

Context

What has been done

Validation

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

Attention: Patch coverage is 97.82609% with 3 lines in your changes missing coverage. Please review.

Project coverage is 92.05%. Comparing base (6d0d8b8) to head (ac3be17).

Files with missing lines	Patch %	Lines
...gshield/verticals/secret/secret_scan_collection.py	97.14%	2 Missing ⚠️
ggshield/verticals/secret/extended_match.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1035   +/-   ##
=======================================
  Coverage   92.05%   92.05%           
=======================================
  Files         181      181           
  Lines        7726     7755   +29     
=======================================
+ Hits         7112     7139   +27     
- Misses        614      616    +2     

Flag	Coverage Δ
unittests	92.05% <97.82%> (+<0.01%)	⬆️

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