Remove k8s/ directory pins with cert-manager changes upstreamed

[ddelnano]

Summary: Remove k8s/ directory pins with cert-manager changes upstreamed

This removes the k8s/ directory pin that was protected the cert-manager changes upstreamed in pixie-io@77e8d9e and pixie-io@7622689.

Relevant Issues: N/A

Type of change: /kind cleanup

Test Plan: Will watch the next copybara sync to verify it merges properly

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 2a839208-443c-4df4-ac9c-a06a29ad8e19

📥 Commits

Reviewing files that changed from the base of the PR and between 53d09cc and 5af3d65.

📒 Files selected for processing (1)

• tools/private/copybara/copy.bara.sky

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📝 Walkthrough

Walkthrough

The Copybara ignored_dirs in copy.bara.sky is updated to replace the broad k8s/** ignore with explicit paths for fork-specific Kubernetes files: plugin/updater YAMLs, k8s/vizier/BUILD.bazel, and the exposed_services_traefik overlay subtree. Inline comments document the new upstream sync stance.

Changes

Copybara k8s ignore refinement

Layer / File(s)	Summary
Targeted k8s ignore paths tools/private/copybara/copy.bara.sky	Replaces the catch-all k8s/** entry in ignored_dirs with specific fork-divergent paths (plugin/updater YAMLs, k8s/vizier/BUILD.bazel, k8s/cloud/overlays/exposed_services_traefik/**) and adds comments noting the k8s cloud/vizier cert-manager area is no longer frozen upstream.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• k8sstormcenter/pixie#39: Also modifies ignored_dirs/fork_only_files in copy.bara.sky to adjust path-filtering rules for Copybara sync.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly reflects the main change: removing the k8s/ pin after cert-manager changes were upstreamed.
Description check	✅ Passed	The description is directly related to the change and explains why the k8s/ pin can be removed.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ddelnano/remove-k8s-directory-pin

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