fix: Log ignored certificates during client authentication

[hrishikesh-nalawade]

Description

API-Layer filters out its own certificates during client authentication but doesn't log which certificates were ignored, making troubleshooting difficult.

• Created shared CertificateLoggingUtils utility class for certificate logging
• Added logging to both CategorizeCertsFilter and CategorizeCertsWebFilter

Linked to #4164

Type of change

Please delete options that are not relevant.

• fix: Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code follows the style guidelines of this project
• PR title conforms to commit message guideline ## Commit Message Structure Guideline
• I have commented my code, particularly in hard-to-understand areas. In JS I did provide JSDoc
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[pablocarle]

Are the comments needed? The method name is self-explanatory

[hrishikesh-nalawade]

yes, will remove most of the comments after after review and before merging.

[pablocarle]

What about microservices' mode CategorizeCertsFilter? Do we want to print it also there? It's still the most used configuration mode and it may be helpful to have more diagnostics there

[pablocarle]

Does the PR fix #4164 fully? The issue also refers to documentation update

[hrishikesh-nalawade]

What about microservices' mode CategorizeCertsFilter? Do we want to print it also there? It's still the most used configuration mode and it may be helpful to have more diagnostics there

Thank You for pointing that out, I was not aware of that. I'll implement the changes in CategorizeCertsFilter as well.

[sonarqubecloud]

Quality Gate passed

Issues
7 New issues
0 Accepted issues

Measures
0 Security Hotspots
89.7% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud