cross: create new variant with protobuf version 3.0.2

[cpanato]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Create another kube-cross variant using go 1.15.8 and the old protobuf version (3.0.2)

the protobuf was bumped in this PR to add support for arm64 however it needs some update in the k/k generated files.

For the existing release branches (1.20/1.19) we want to avoid the update of the generated files to reduce a possible introduction of issues (for reference: kubernetes/kubernetes#98962 (review))

/assign @dims @justaugustus

Which issue(s) this PR fixes:

None

Special notes for your reviewer:

Does this PR introduce a user-facing change?

cross: create new variant with protobuf version 3.0.2

[k8s-ci-robot]

@cpanato: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
pull-release-image-kube-cross	2d22ad3	link	/test pull-release-image-kube-cross

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[justaugustus]

/lgtm
/approve

[cpanato]

@justaugustus PTAL when having a chance

[justaugustus]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cpanato, justaugustus

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