Added logging for certificate verification when linked and added testing

[janssensjelle]

Types of changes

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• Bugfix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality not to work as expected).
• Documentation Update (if none of the other choices applies).

Proposed changes

Sends a message to the verification channel of saying which user used which cert id

Checklist

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• I have read and followed the CONTRIBUTING.md
  doc.
• Lint and unit tests pass locally with my changes.
• I have added the necessary documentation (if appropriate).

Additional context

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[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.10%. Comparing base (0f08c66) to head (da620c1).
⚠️ Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
src/webhooks/handlers/academy.py	75.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #178      +/-   ##
==========================================
+ Coverage   61.74%   62.10%   +0.35%     
==========================================
  Files          50       50              
  Lines        2941     2953      +12     
==========================================
+ Hits         1816     1834      +18     
+ Misses       1125     1119       -6     

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[dimoschi]

Good feature overall — the audit logging is a useful addition and the tests are well-structured. Two things to address before merging:

1. The channel send needs its own try/except (see inline). As-is, a Discord API failure on the log message will be misreported as a role assignment error and cause an incorrect failure response to the webhook caller, even though the role was already applied. account.py has the right pattern.
2. Missing test for the verify_channel = None path — one uncovered line flagged by Codecov.

[dimoschi]

@janssensjelle thanks for addressing my comments. The PR looks good.