chore: remove release workflow test file

[busla]

Summary

Removes the temporary projects/.release-trigger-test file used to verify the release workflow.

The release workflow has been verified working end-to-end:

• Run: https://github.com/edbook/haskoli-islands/actions/runs/22003238924
• Release: https://github.com/edbook/haskoli-islands/releases/tag/v26.02.13.1
• All 4 jobs passed: generate-version, build-docs, create-release, notify-discord

🤖 Generated with Claude Code

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch cleanup/remove-release-test

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[github-actions]

📚 PR Documentation Deployed

Your PR documentation is available with enhanced build performance:

🔗 PR Documentation: https://edbook.github.io/haskoli-islands/cleanup/remove-release-test/
🔗 Individual Projects: Available at https://edbook.github.io/haskoli-islands/cleanup/remove-release-test/[project-name]/

✨ Performance Features:

• ⚡ Parallel builds (4x faster)
• 💾 Intelligent caching
• 🏗️ Optimized Sphinx configuration
• 📊 Build statistics included

Version: 26.02.13.2125+9348a03