CLP-164 Move Renovate config to .github/renovate.json

[vdiez]

Part of CLP-11.

This PR normalizes the Renovate config location to .github/renovate.json without changing effective Renovate behavior.

Expected current effective delta:

• none

---

Summary by Gitar

• Renovate configuration:
  • Changed the Renovate preset to github>SonarSource/renovate-config:quality-corelang-squad.
  • Cleaned up the configuration file by removing specific project rules no longer required.

_{This will update automatically on new commits.}

[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
No data about Duplication

See analysis details on SonarQube

[pavel-mikula-sonarsource]

LGTM

[gitar-bot]

Code Review ✅ Approved

Normalizes the Renovate configuration by moving it to .github/renovate.json. No issues found.

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