Update release process to reflect that most of it is more neutral now

[SgtCoDFish]

This is part of the graduation process!

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[inteon]

Thanks for updating the docs! For reference: All cert-manager's infrastructure is now defined here: https://github.com/cert-manager/infrastructure The prow cluster config can be found here: https://github.com/cert-manager/testing

/approve /lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: inteon

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