chore: configure Renovate pinning and SonarQube test exclusions

[google-labs-jules]

This change updates the repository configuration to:

1. Instruct Renovate to pin all dependencies (runtime and dev) by extending :pinDependencies in renovate.json.
2. Configure SonarQube to ignore all issues (bugs, smells, security hotspots) in the tests directory using sonar.issue.ignore.multicriteria, preventing false positives on test data (e.g. hardcoded IPs) while preserving test files for coverage metrics.

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PR created automatically by Jules for task 12482522409728136580 started by @thib3113

[google-labs-jules]

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

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

See analysis details on SonarQube Cloud

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.60%. Comparing base (c6f2ee2) to head (a82f9bf).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #68   +/-   ##
=======================================
  Coverage   77.60%   77.60%           
=======================================
  Files          33       33           
  Lines         509      509           
  Branches       87       90    +3     
=======================================
  Hits          395      395           
  Misses        114      114           

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