WIP: Migrate to Renovate shared preset

[erikgb]

Ref. https://github.com/cert-manager/renovate-config

[cert-manager-prow]

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[cert-manager-prow]

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The list of commits missing DCO signoff:

• d9db6be Revert "Revert delete of renovate.json5"
• bf1fa3a Revert "Try using rsync to conditionally copy Renovate config"

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[cert-manager-prow]

PR needs rebase.

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