chore: resolve sonar issues in contact-summary-emitter

[jkuester]

Description

The main goal here is to refactor this contact-summary-emiter code to resolve this sonar issue.

Code review items

• Readable: Concise, well named, follows the style guide, documented if necessary.
• Documented: Configuration and user documentation on cht-docs
• Tested: Unit and/or integration tests where appropriate
• Backwards compatible: Works with existing data and configuration. Any breaking changes documented in the release notes.

License

The software is provided under AGPL-3.0. Contributions to this project are accepted under the same license.

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