SONARJAVA-6233 Add slf4j-simple to capture logs from the orchestrator

[tomasz-tylenda-sonarsource]

Tested:

• verified that the log of ruling QA does not grow excessively: ubuntu without-sonarqube: 12697 -> 12882 lines.
• verfied that the log of plugin QA containst orchestrator logs, for example, "com.sonar.orchestrator.locator.MavenLocator - Found (...)". Since it is polluted with debug statements anyway (they are neede for telemetry) I did not check the size.

[hashicorp-vault-sonar-prod]

SONARJAVA-6233

[sonar-review-alpha]

Summary

Adds slf4j-simple binding to test dependencies to enable SLF4J logging from the orchestrator. Without an SLF4J implementation, the library defaults to a no-op logger that silently discards all logs. This change provides actual console output during test runs while keeping log volume reasonable (verified minimal growth in QA logs).

What reviewers should know

What changed: Added slf4j-simple to its/plugin/tests and its/ruling test modules, and extracted the SLF4J version to a parent POM property for consistency.

Why this matters: Tests were missing orchestrator logs entirely because SLF4J had no implementation configured. slf4j-simple is a minimal, lightweight binding suitable for tests.

Review focus: The changes are straightforward dependency additions. Note the version is already managed in the parent POM (1.7.30) for consistency with existing slf4j-api dependency. The author's testing confirms this doesn't cause log spam — the increase is negligible (~185 lines out of ~13k).

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[sonarqube-next]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
0 Dependency risks
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarQube

[sonar-review-alpha]

LGTM! ✅

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[asya-vorobeva]

👍