blockades: prevent direct changes to staging repos in kubernetes/k8s.io

[sAchin-680]

What type of PR is this?

/kind cleanup
/area prow

What this PR does / why we need it:

This PR introduces a new blockades rule to prevent direct modifications to the staging/ directories in the kubernetes/k8s.io repository.

These staging repos are intended to be mirrored from upstream sources (e.g., kubernetes/kubernetes), and changes should be made at the source instead. Blocking direct edits here helps maintain consistency, prevents configuration drift, and ensures changes follow the intended workflows.

Special notes for your reviewer:

• Consistent with existing blockades patterns defined in config.yaml
• The message clearly communicates where changes should be proposed instead

Does this PR introduce a user-facing change?

NONE

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This pull-request has been approved by: sAchin-680
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[k8s-ci-robot]

Hi @sAchin-680. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[sAchin-680]

Done as per your suggestion, replaced Go module import paths with actual GitHub repo names, and ensured client-go and other existing staging repos have matching config. Let me know if anything else needs adjustment!