Handle trailing content in multi-parent hunk header

[sevbch]

Context

When running a scan on a multi-parent commit with a hunk header with a trailing content, parsing of the header would fail and raise a PatchParseError.

This PR relates to #1022.

What has been done

Handle trailing content in the regex used to parse multi-parent hunk header.

Validation

• Using previous version, on this repo

ggshield secret scan commit-range eb052f92b8bdaf0b32b9de1f1bc8c9493496c50f^..eb052f92b8bdaf0b32b9de1f1bc8c9493496c50f
Error: Could not parse patch (sha: eb052f92b8bdaf0b32b9de1f1bc8c9493496c50f): Failed to parse multi-parent hunk header '@@@ -23,37 -22,21 +23,52 @@@ from ggshield.core.types import Ignored'
Error: Could not parse patch (sha: eb052f92b8bdaf0b32b9de1f1bc8c9493496c50f): Failed to parse multi-parent hunk header '@@@ -23,37 -22,21 +23,52 @@@ from ggshield.core.types import Ignored'
Error: Could not parse patch (sha: eb052f92b8bdaf0b32b9de1f1bc8c9493496c50f): Failed to parse multi-parent hunk header '@@@ -23,37 -22,21 +23,52 @@@ from ggshield.core.types import Ignored'
Error: Could not parse patch (sha: eb052f92b8bdaf0b32b9de1f1bc8c9493496c50f): Failed to parse multi-parent hunk header '@@@ -23,37 -22,21 +23,52 @@@ from ggshield.core.types import Ignored'
Error: Could not parse patch (sha: eb052f92b8bdaf0b32b9de1f1bc8c9493496c50f): Failed to parse multi-parent hunk header '@@@ -23,37 -22,21 +23,52 @@@ from ggshield.core.types import Ignored'
Scanning... ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 100% 5 / 5

No secrets have been found

• On this branch

ggshield secret scan commit-range eb052f92b8bdaf0b32b9de1f1bc8c9493496c50f^..eb052f92b8bdaf0b32b9de1f1bc8c9493496c50f
Scanning... ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 100% 5 / 5

No secrets have been found

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 (6d0d8b8) to head (c2355f1).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1033   +/-   ##
=======================================
  Coverage   92.05%   92.05%           
=======================================
  Files         181      181           
  Lines        7726     7729    +3     
=======================================
+ Hits         7112     7115    +3     
  Misses        614      614           

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

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