Update code-generator to 1.30.0

[xing-yang]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug

/kind cleanup

/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:
code-generator/generate-groups.sh is no longer worker in 1.30.
Use code-generator/kube_codegen.sh instead.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Replace code-generator/generate-groups.sh with code-generator/kube_codegen.sh in update-generated-code.sh.

[k8s-ci-robot]

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This pull-request has been approved by: xing-yang

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[xing-yang]

/assign @jsafrane

[jsafrane]

/lgtm