add Christian to CODEOWNERS, fix email script column name

[edasmalchi]

Description

Change the email script to match column names from Hubspot exports.

Also, add @csuyat-dot to CODEOWNERS.

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation

How has this been tested?

emails sent successfully

[github-actions[bot]]

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