chore: inherit renovate config from shared renovate config repo

[yocaba]

What

Relates to https://github.com/opendefensecloud/odd-internal/issues/32.

Why

We created a new repo renovate-config with shared Renovate configurations: opendefensecloud/renovate-config#2.

Instead of duplicating the renovate configs in our repos, we start creating shared Renovate configs in there and only keep repo-specific Renovate configs.

Testing

After this PR has been merged, I gonna check Renovate's "Dependency Dashboard" ticket for detected dependencies.

Checklist

• Tests added/updated n/a
• No breaking changes (or upgrade path documented above)
• Readable commit history (squashed and cleaned up as desired)
• AI code review considered and comments resolved

Summary by CodeRabbit

• Chores
  • Simplified Renovate configuration by switching to a centralized custom configuration source, replacing the previous setup.
  • Removed custom dependency management rules, streamlining the configuration footprint.

[coderabbitai]

📝 Walkthrough

Walkthrough

Configuration update to consolidate Renovate dependencies: the config now extends from a centralized org-level custom Renovate config instead of defaults, with two previously-defined custom managers removed.

Renovate Configuration Update

Layer / File(s)	Summary
Renovate extends and custom managers renovate.json	Updated extends from config:recommended to github>opendefensecloud/renovate-config, and removed two customManagers entries for DEV_KIT_VERSION extraction and Go module version tracking.

🎯 1 (Trivial) | ⏱️ ~2 minutes

🐰 A config migration done with grace,
Defaults replaced with custom space,
Managers removed in thoughtful measure,
Centralized setup—a rabbit's pleasure! 🎉

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title directly reflects the main change: updating Renovate configuration to inherit from a shared config repo instead of using the default recommended config.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	PR description follows the template structure with What, Why, Testing, and Checklist sections, though the Notes for reviewers section is missing.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/inherit-renovate-config

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