chore(copilot): ignore vendor directory

[a7i]

Add .copilotignore to exclude vendor/** from Copilot context so PR reviews can stay under file limits.

[k8s-ci-robot]

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[Copilot]

Pull request overview

Adds a .copilotignore file to exclude the repository’s vendor/ tree from GitHub Copilot context, helping keep Copilot-assisted reviews within file-size / file-count limits.

Changes:

• Introduces .copilotignore at the repo root.
• Ignores vendor/** so vendored dependencies aren’t included in Copilot context.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[a7i]

/retest-required

[a7i]

/retest-required

[k8s-ci-robot]

@a7i: 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
pull-descheduler-test-e2e-k8s-master-1-36	5fd4c1e	link	true	/test pull-descheduler-test-e2e-k8s-master-1-36

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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