chore: migrate from Dependabot to Renovate [EXT-7411]

[Jared Jolton (jjolton-contentful)]

Summary

Migrates this repository from Dependabot to Renovate for dependency management.

Why: Contentful is standardizing on Renovate for better control over automerge policies, shared org-level defaults, and noise reduction.

What changed:

• Added renovate.json extending the shared contentful/renovate-config preset
• Removed .github/dependabot.yml
• Removed any Dependabot-only workflow files (if applicable)

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Migration Confidence: 🟢 High

Summary

Deleted dependabot.yml and its associated GitHub workflow, created renovate.json extending contentful/renovate-config with npm enabled, registry aliases, GitHub auth, and version constraints for @types/node and prettier.

[bito-code-review]

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