Release 1.20 cut details for v1.20.0

[cemakd]

/kind feature

What this PR does / why we need it:
Put 1.20.0 release into stable-master.

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

Hi @cemakd. Thanks for your PR.

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[mattcary]

/lgtm
/approve

You'll need to rebase though it looks like.

Also, it seems that we're missing the 1.19 and 1.20 changelogs? IIRC these should be in the master now and not release branches.

[mattcary]

/lgtm
/approve
/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cemakd, mattcary

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