ci(validate): add conclusion job to gate on matrix results

[cblecker]

Summary

• Adds a conclusion job to the validate workflow that aggregates results from both validate-marketplace and validate-plugins jobs
• Provides a single stable status check name ("Validate Plugins Conclusion") for branch protection, instead of relying on individual matrix job contexts that change as plugins are added or removed

Test plan

• Verify the conclusion job appears in the workflow run for this PR
• Verify it passes when all upstream jobs pass
• After merge, update branch protection to require "Validate Plugins Conclusion" and remove individual plugin job contexts

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 18f9c8d3-140a-4707-a626-443a40e86c48

📥 Commits

Reviewing files that changed from the base of the PR and between 9543da2 and e70f21e.

📒 Files selected for processing (1)

• .github/workflows/validate.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/validate-conclusion

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