Group dependabot updates by package origin

[sebrandon1]

Summary

• Add k8s and openshift groups to consolidate related package updates into single PRs
• Groups k8s.io/* and sigs.k8s.io/* packages together for coordinated updates
• Groups github.com/openshift/* packages together
• Updates existing version-updates group to exclude the above patterns

This reduces PR noise and makes dependency updates easier to review.

Related PRs

This change is part of a coordinated effort across multiple OpenShift repositories:

• Group dependabot updates by package origin kube-compare#253
• Group dependabot updates by package origin assisted-service#8716
• Group dependabot updates by package origin backplane-cli#873
• Group dependabot updates by package origin cluster-openshift-apiserver-operator#636
• Group dependabot updates by package origin containernetworking-plugins#221
• Group dependabot updates by package origin ingress-node-firewall#690
• Group dependabot updates by package origin #1336 (this PR)
• Group dependabot updates by package origin pf-status-relay-operator#51

Tracked by: CNFCERT-1301

Test plan

• Verify dependabot.yml syntax is valid
• Wait for next dependabot run to confirm groups are applied correctly

🤖 Generated with Claude Code

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci]

@sebrandon1: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/okd-scos-images	1072982	link	true	/test okd-scos-images

Full PR test history. Your PR dashboard.

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