Remove tools/ and ci/ from copybara pin

[ddelnano]

Summary: Remove tools/ and ci/ from copybara pin

Relevant Issues: N/A

Type of change: /kind cleanup

Test Plan: Re-run copybara action and verify it passes (currently failing)

[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: e2d39b11-fc13-4551-a265-1f151c6562da

📥 Commits

Reviewing files that changed from the base of the PR and between 57e7026 and 8174141.

📒 Files selected for processing (3)

• .github/workflows/copybara_pixie_oss.yaml
• ci/private/run_copybara.sh
• tools/private/copybara/copy.bara.sky

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📝 Walkthrough

Walkthrough

The PR relocates Copybara infrastructure to private directories: the GitHub Actions workflow now invokes ci/private/run_copybara.sh with tools/private/copybara/copy.bara.sky. The Copybara config removes tools/** from ignored_dirs and updates fork_only_files to include ci/private/** and tools/private/**.

Changes

Copybara infrastructure reorganization to private directories

Layer / File(s)	Summary
Workflow invocation update .github/workflows/copybara_pixie_oss.yaml	GitHub Actions workflow is updated to invoke the Copybara script from ci/private/ and reference the config file from tools/private/copybara/ instead of the prior public locations.
Copybara path filtering configuration tools/private/copybara/copy.bara.sky	Copybara configuration filters are updated: tools/** removed from ignored_dirs so tools/ is included in origin files; fork_only_files replaces ci/run_copybara.sh with ci/private/** and adds tools/private/**, keeping the other fork-only entries.

🎯 2 (Simple) | ⏱️ ~5 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately reflects the main change: removing tools/ and ci/ paths from the Copybara configuration pinning.
Description check	✅ Passed	The description is clearly related to the changeset, explaining the removal of tools/ and ci/ from Copybara pin with context about testing.
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ddelnano/remove-tools-ci-pins-from-copybara

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