Normalize email alert recipients

[KristopherKubicki]

Summary

• strip and filter configured email recipients before sending alerts
• cover recipient normalization and missing-recipient handling in email alert tests

Testing

• flake8 app/utils/email_alerts.py tests/test_email_alerts.py
• pytest -n0 tests/test_email_alerts.py

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Codex Task

[coderabbitai]

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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 codex/normalize-email-recipients-in-send_email_alert

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[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

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[Copilot]

Pull Request Overview

This PR enhances email alert recipient handling by normalizing the configured recipient list before sending alerts. The implementation strips whitespace from each email address and filters out any empty values that may result from trailing commas or consecutive delimiters.

• Normalizes email recipients by stripping whitespace and filtering empty strings
• Adds validation to prevent sending emails when no valid recipients remain after normalization
• Comprehensive test coverage for recipient normalization and missing recipient scenarios

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
app/utils/email_alerts.py	Implements recipient normalization logic and adds validation to handle empty recipient lists
tests/test_email_alerts.py	Updates existing test with whitespace/empty values, adds new test for no valid recipients scenario, and verifies "To:" header formatting

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