Implement unit tests where applicable when moving the goals screen

[autumnfjeld]

Calypso has a lack of unit tests. In onboarding it is particularly important to include unit tests as an instrument of product quality since onboarding is a first impression.

ToDo

• Add list of unit tests or add accompany sub-issue to dev tasks once dev tasks are defined in the parent issue.

[github-actions]

OpenAI suggested the following labels for this issue:

• [Feature Group] Developer & Contractor Tools: The issue focuses on improving code quality through unit tests, which is crucial for developers working on the project.
• [Feature] Calypso & wp-admin Navigation: As the context involves implementing unit tests in Calypso, this label is relevant to navigate within its development environment.
• [Feature] API: Unit tests are often essential for ensuring that APIs function correctly, thus supporting reliable interactions with Calypso's backend.
• [Feature] Site Performance: Improving unit tests can contribute to the overall performance and stability of the application, ensuring a better user experience.