Remove dependabot and add more dependencies to renovate

[lucacome]

Proposed changes

Removes the configuration files for dependabot and uses the labeler.yml config in https://github.com/nginxinc/k8s-common. Also adds more dependencies for renovate and fixes linter errors

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• [ ] I have read the CONTRIBUTING guide
• [ ] I have proven my fix is effective or that my feature works
• [ ] I have checked that all unit tests pass after adding my changes
• [ ] I have ensured the README is up to date
• [ ] I have rebased my branch onto main
• [ ] I will ensure my PR is targeting the main branch and pulling from my branch on my own fork